\ ˈkül How to pronounce cool (audio) \

Definition of cool

 (Entry 1 of 4)

1 : moderately cold : lacking in warmth The plant grows best in cool climates.
2a : marked by steady dispassionate calmness and self-control a cool and calculating businessperson
b : lacking ardor or friendliness a cool impersonal manner
c of jazz : marked by restrained emotion and the frequent use of counterpoint
d : free from tensions or violence We used to fight, but we're cool now.
3 used as an intensivea cool million dollars
4 : marked by deliberate effrontery or lack of due respect or discretion a cool reply
5 : facilitating or suggesting relief from heat a cool dress
6a of a color : producing an impression of being cool specifically : of a hue in the range violet through blue to green
b of a musical tone : relatively lacking in timbre or resonance (see resonance sense 2a)
7 informal
a : very good : excellent That was a really cool movie. also : all right Is getting together Friday night cool with you?
b : fashionable, hip … not happy with the new shoes … because they were not "cool."— Celestine Sibley


cooled; cooling; cools

Definition of cool (Entry 2 of 4)

intransitive verb

1 : to become cool : lose heat or warmth placed the pie in the window to cool sometimes used with off or down
2 : to lose ardor or passion His anger cooled.

transitive verb

1 : to make cool : impart a feeling of coolness to cooled the room with a fan often used with off or downA swim cooled us off a little.
2a : to moderate the heat, excitement, or force of : calm cooled her growing anger
b : to slow or lessen the growth or activity of usually used with off or downwants to cool off the economy without freezing itNewsweek
cool it
: to calm down : go easy The word went out to the young to cool it.— W. M. Young
cool one's heels
: to wait or be kept waiting for a long time especially from or as if from disdain or discourtesy



Definition of cool (Entry 3 of 4)

1 : a cool time, place, or situation the cool of the evening
2a : absence of excitement or emotional involvement : detachment … must surrender his fine cool and enter the closed crazy world of suicide …— Wilfrid Sheed
b : poise, composure The player lost his cool and began yelling at the referee.



Definition of cool (Entry 4 of 4)

: in a casual and nonchalant manner play it cool

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Other Words from cool


coolish \ ˈkü-​lish How to pronounce coolish (audio) \ adjective
coolly or less commonly cooly \ ˈkü(l)-​lē How to pronounce cooly (audio) \ adverb
coolness \ ˈkül-​nəs How to pronounce coolness (audio) \ noun

Choose the Right Synonym for cool


cool, composed, collected, unruffled, imperturbable, nonchalant mean free from agitation or excitement. cool may imply calmness, deliberateness, or dispassionateness. kept a cool head composed implies freedom from agitation as a result of self-discipline or a sedate disposition. the composed pianist gave a flawless concert collected implies a concentration of mind that eliminates distractions especially in moments of crisis. the nurse stayed calm and collected unruffled suggests apparent serenity and poise in the face of setbacks or in the midst of excitement. harried but unruffled imperturbable implies coolness or assurance even under severe provocation. the speaker remained imperturbable despite the heckling nonchalant stresses an easy coolness of manner or casualness that suggests indifference or unconcern. a nonchalant driver

Examples of cool in a Sentence

Adjective The weather is cool today. The surface is cool to the touch. The plant grows best in cool climates. I'm feeling a little cool. We changed into some cooler clothes. She remained calm, cool, and collected. Verb The fan cools the engine. the cooling effect of the breeze Allow the cake to cool before slicing. the cooling of the ocean waters I took a break from the discussion to allow my anger to cool. His interest in her has cooled somewhat. Noun the judge's customary cool stood him in good stead during the sensational trial I envy you your cool. Adverb Here comes Mom. Act cool and she won't suspect a thing.
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Recent Examples on the Web: Adjective The silhouette is my favorite: classic pointed toe, slight heel, and a V-cutout to show off ankles and keep feet cool during a commute. Liv Birdsall, USA TODAY, "20 great pairs of shoes perfect for fall," 24 Sep. 2020 It’s also vented to help keep your laptop cool while your processor works overtime streaming the video. David Petkiewicz, cleveland, "Want to look better on your Zoom videos? Professional photographer shares tips, budget-friendly products," 23 Sep. 2020 Oh, and turkey vultures also urinate and defecate on their own legs to keep cool. René A. Guzman, ExpressNews.com, "S.A.’s Common Critters: Turkey vultures, black vultures more than just Mother Nature’s cleanup crew," 22 Sep. 2020 Keep it cool with this sweet, cinnamony rice-and-milk beverage. Washington Post, "7 recipes featuring fall’s real favorite spice: Cinnamon," 21 Sep. 2020 There’s spacer fabric to keep material off the mouth and nose, an open-cell foam layer to let air pass but block sweat, and UA ISO-Chill to keep skin cool, while also protecting with PROTX2 antimicrobial technology. Rachel Chang, Condé Nast Traveler, "Is the Under Armour Sportsmask Really Worth the Hype?," 16 Sep. 2020 Cal Fire officials smoke and haze are continuing to impact the region, which could keep temperatures cool through Friday. Chronicle Staff, SFChronicle.com, "California wildfires: Live updates Sept. 10-11," 15 Sep. 2020 Hot sleepers will love the fact that a breathable design will keep them cool all night long. Courtney Thompson, CNN Underscored, "30 of the coolest products at Wayfair you never knew about," 15 Sep. 2020 In patterns that scientists say have been exacerbated by climate change, heatwaves in the Levant and North Africa are becoming more frequent, longer, and hotter, leaving millions struggling to keep cool. Taylor Luck, The Christian Science Monitor, "In superheated Arab world, there are AC haves and have-nots," 11 Sep. 2020 Recent Examples on the Web: Verb First, give it a little time to cool and/or stop smoking. Christopher Michel, Country Living, "Help! I Just Burned the Turkey. Can I Save It?," 2 Oct. 2020 Remove nuts with a slotted spoon and set aside on a plate to cool. SFChronicle.com, "Recipes for summer’s bounty: Salads & sides," 17 Sep. 2020 After a few days of lukewarm breezes temperatures cool off in coming days. Paul Douglas, Star Tribune, "Western Fires and a Gulf Coast Hurricane, But No Weather Drama Here," 15 Sep. 2020 After weathering frustration all night with bumps and non-calls from the referees, Dallas Mavericks star Luka Dončić finally had some time to cool off. Mark Medina, USA TODAY, "Mavs' Luka Dončić called his play 'terrible' despite setting record for most points in NBA playoff debut," 18 Aug. 2020 Getting into the air conditioning is a smart way to cool down, too. Joe Genzel, Outdoor Life, "8 Drills to Do Right Now to Get Your Gun Dog Ready for Fall," 17 Aug. 2020 Philadelphia also closed its pools, but opened all the spray parks, offering some way for city kids to cool off. Petula Dvorak, Washington Post, "A long, hot summer becomes longer and hotter, thanks to D.C. pool closures," 6 Aug. 2020 So what better way to cool off than a dish of homemade ice cream? Luann Gibbs, The Enquirer, "How to make ice cream with no ice cream maker 🍦🍨," 10 July 2020 Going into these waterways, however, is not the best way to cool off. cleveland, "Church doors open to welcoming hearts: Olmsted Dates and Data," 1 June 2020 Recent Examples on the Web: Noun With the uncertainty surrounding the season due to the coronavirus pandemic, McGuinness moved its senior night to the first game — a tradition usually held on the last home game of the season in the cool of a November night. USA Today, "Sports adapt to coronavirus restrictions as competition continues," 25 Sep. 2020 After a 10-minute cool down period, a second temperature check will be conducted. Cameron Teague Robinson, The Courier-Journal, "Louisville announces attendance capacities for field hockey and men's and women's soccer," 23 Sep. 2020 So the key for the Lynx is to keep their collective cool while turning up the intensity. Kent Youngblood, Star Tribune, "Down 2-0, Lynx need to win three in row — something no WNBA team has done before in 13 best-of-five playoff series," 27 Sep. 2020 Temperatures will drop later in the week, but with the cool-off comes showers. Sarah Brookbank, The Enquirer, "Cincinnati weather: Wednesday's high above 90, but a cool down is coming," 10 Sep. 2020 Flesch, the third generation owner of the shop, gained widespread support on social media for keeping his cool after his family business burned last time, refusing to be angry at the people who destroyed it. Javonte Anderson, chicagotribune.com, "Downtown businesses on edge after this morning’s looting, vandalism. ‘It’s definitely a setback.'," 10 Aug. 2020 And after making the Boston Celtics lose another big lead on the court — as well as their cool in the postgame locker room — the unheralded Heat are two wins away from the NBA Finals. Tim Reynolds, Star Tribune, "Comeback Heat do it again, rally past Celtics for 2-0 lead," 18 Sep. 2020 There’s trouble in paradise when drama erupts between Vairrun and Meco, plus Greg boils over and loses his cool on Robin. Nina Zafar, Washington Post, "What to watch on Thursday: ‘The Great Pottery Throwdown’ on HBO Max," 17 Sep. 2020 Since drip irrigation doesn’t wet leaves, run it in the cool of the evening or early morning. Nan Sterman, San Diego Union-Tribune, "September chores for home gardeners," 5 Sep. 2020 Recent Examples on the Web: Adverb Microsoft also offered a minor update of its cool-looking but poorly reviewed Surface X tablet, which runs Windows on a custom ARM chip instead of a typical Intel processor. Aaron Pressman, Fortune, "Microsoft offers cheapest Surface laptop yet to take on Chromebooks," 1 Oct. 2020 This one from Aerie makes a great gift, with its pretty lace material, eight color options and cool-looking strappy back. Sara Hendricks, USA TODAY, "35 gifts teenage girls actually want in 2020," 25 Sep. 2020 For all the media coverage of this cool-sounding partnership, answers are fuzzy on what the affects might be for Cowboys fans and Whataburger fans. Sarah Blaskovich, Dallas News, "Whataburger is the official burger of the Dallas Cowboys — but they’re not selling Whataburger at Cowboys games," 10 Sep. 2020 An aerospace engineer in Clear Lake, Texas, Mahler is used to putting puzzle pieces together and taking a calm, cool-headed approach to problems. Megan E. Doherty, Smithsonian Magazine, "What Happens When Children’s Covid-19 Symptoms Won’t Go Away," 11 Sep. 2020 Former Game of Thrones star Sophie Turner and her husband, Joe Jonas, were spotted yesterday wearing cool-toned matching duds while hanging out in a park with family. Chelsey Sanchez, Harper's BAZAAR, "Sophie Turner Wraps Up in Plaid for a Park Date with Joe Jonas," 17 July 2020 But coordinated, cool-headed, honest messaging from government officials and public-health experts would have gone a long way toward allaying undue anxiety. Jacob Stern, The Atlantic, "This Is Not a Normal Mental-Health Disaster," 7 July 2020 Transfer to a wire rack and let cool before filling. Allison Robicelli, Washington Post, "It took years of searching (and some terrible slices) to get to a chocolate pie we all deserve," 3 July 2020 His East Dallas shop, which opened in 2010, is the granddad of artisan doughnuts in D-FW and helped make wacky doughnuts cool here. Sarah Blaskovich, Dallas News, "8 delicious doughnut shops in Dallas-Fort Worth on National Donut Day, June 5," 4 June 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cool.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of cool


before the 12th century, in the meaning defined at sense 1


before the 12th century, in the meaning defined at intransitive sense 1


15th century, in the meaning defined at sense 1


1968, in the meaning defined above

History and Etymology for cool


Middle English col, going back to Old English cōl, going back to West Germanic *kōlu- (whence also Middle Dutch coele "moderately cold" and, from a variant *kōlja-, Old High German kuoli), lengthened-grade derivative from the base of *kalan- "to be cold" — more at cold entry 1


Middle English colen, going back to Old English cōlian, verbal derivative from Germanic *kōl- cool entry 1 (whence also Old Saxon colon "to become cool," Old High German kuolēn)


Middle English cole, derivative of col cool entry 1


derivative of cool entry 1

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Learn More about cool

Time Traveler for cool

Time Traveler

The first known use of cool was before the 12th century

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Statistics for cool

Last Updated

14 Oct 2020

Cite this Entry

“Cool.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cool. Accessed 22 Oct. 2020.

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More Definitions for cool

How to pronounce cool (audio)

English Language Learners Definition of cool

 (Entry 1 of 3)

: somewhat cold : not warm or hot
: made of a light, thin material that helps you stay cool
: able to think and act in a calm way : not affected by strong feelings



English Language Learners Definition of cool (Entry 2 of 3)

: to make (someone or something) cool
: to become cool : to lose heat or warmth
: to become less strong or intense especially in emotion



English Language Learners Definition of cool (Entry 3 of 3)

informal : in a calm manner : in a way that does not seem unusual or excited
\ ˈkül How to pronounce cool (audio) \
cooler; coolest

Kids Definition of cool

 (Entry 1 of 3)

1 : somewhat cold : not warm a cool day a cool room
2 : not letting or keeping in heat cool clothes
3 : calm entry 3 sense 2 She is cool in a crisis.
4 : not interested or friendly He was cool to my idea.
5 : fashionable, stylish, or attractive in a way that is widely approved of
6 : very good excellent

Other Words from cool

coolly adverb
coolness noun


cooled; cooling

Kids Definition of cool (Entry 2 of 3)

: to make or become less warm



Kids Definition of cool (Entry 3 of 3)

1 : a time or place that is not warm the cool of the evening
2 : a calm state of mind Keep your cool.

Legal Definition of cool

: to lose passion : become calm sometimes used with off or down the time elapsing…is such that a reasonable man thus provoked would have cooled— W. R. LaFave and A. W. Scott, Jr.

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