\ 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 Because after all, the update's new home screen widgets and picture-in-picture features are cool, but having a device full of working software is probably more important. Courtney Linder, Popular Mechanics, "Don't Download Apple's iOS 14 Yet (Just Ask These Developers)," 16 Sep. 2020 If everything’s on fire, thank heaven, at least, that wonky honesty is cool. Bill Mckibben, The New Yorker, "In a Historic Wildfire Season, It’s Time to Follow the Lead of Young Campaigners," 16 Sep. 2020 Celebrities like Nicole Richie and Kristin Cavallari have shown us that raising chickens is actually cool — and this starter coop will get you up and running in no time. Courtney Thompson, CNN Underscored, "30 of the coolest products at Wayfair you never knew about," 15 Sep. 2020 Make sure your bed and pillows are comfortable and the room is cool: Between 60 and 67 degrees is best. Sandee Lamotte, CNN, "Poor sleep linked to weight gain in 2-year smartphone sleep tracking study," 14 Sep. 2020 Field guide topics range from The birth of geriatric cool to China’s changing influence and What Gen Z wants. Adam Epstein, Quartz, "Netflix doesn’t have commercial breaks, but that doesn’t mean it won’t have ads," 13 Sep. 2020 The former Temple star is the epitome of cool and collected on the basketball court. Akeem Glaspie, The Indianapolis Star, "Dupree, McCowan lead Indiana Fever to win over New York Liberty, snapping 8-game losing skid," 11 Sep. 2020 Once the pickling solution is cool, add the onion slices to a metal bowl and cover with boiling water for one minute before straining. San Diego Union-Tribune, "Fish tacos: The lore of a ‘San Diego’ signature dish," 9 Sep. 2020 Temperatures in the fire zone were in the 90s, but that was cool compared to many parts of the state. CBS News, "Record-smashing heat and dramatic rescue in California as wildfires burn statewide," 7 Sep. 2020 Recent Examples on the Web: Verb According to ViralHog, a bear popped into the koi pond this summer to cool off from a 90-degree day. Kelli Bender, PEOPLE.com, "Bear Relaxes in Pennsylvania Family's Brand New Koi Pond Complete with Rubber Duckies," 14 Sep. 2020 Builders may want the red-hot housing market to cool off just a little bit. Paul R. La Monica, CNN, "Housing is still holding up the economy. It's so not like 2008," 14 Sep. 2020 After a big rally, stocks tend to cool off for a while. Russ Wiles, The Arizona Republic, "After wild stock-market ride, this is why it might be time to rebalance your investments," 6 Sep. 2020 The warning calls for scorching temperatures from 11 a.m. Saturday through 9 p.m. Monday across the Bay Area, with little relief, as the fog- and moisture-rich marine air won’t roll in overnight to cool things off. Michael Cabanatuan, SFChronicle.com, "What next? Scorching temperatures add to region’s woes," 4 Sep. 2020 Lake Erie’s water temperatures are beginning to cool off, and that seems to be causing an early migration of walleye to near-shore haunts, especially after dark. cleveland, "Lake Erie smallmouth bass a hot topic: NE Ohio fishing report for weekend of Sept. 4-6," 3 Sep. 2020 The female cast members weren't quite so lucky, and simply had to lift their wigs up to cool off, according to Clarke. Amy Mackelden, Harper's BAZAAR, "Male Game of Thrones Stars Had "Cooling Systems" in Their Outfits," 29 Aug. 2020 The Abarcas take at least three showers a day to cool off. AZCentral.com, "In Phoenix, rising temperatures day and night kill more people each year," 27 Aug. 2020 In the past, the water may have stayed outside to fill a water table or sensory bin, where little hands could splash and children could cool off in the Texas heat. Jackie Mader, USA TODAY, "From air hugs to airplane arms: What reopening daycare centers look like during COVID-19," 26 Aug. 2020 Recent Examples on the Web: Noun 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 Florian must prove himself to Stacey after losing his cool again. Nina Zafar, Washington Post, "What to watch this weekend: ‘Power Book II: Ghost’ on Starz," 5 Sep. 2020 Here's the extended outlook through the 2nd full week of September, which shows a significant cool down with record cold highs possible on Tuesday and Wednesday! Paul Douglas, Star Tribune, "Warm Sunday, Followed By Record Cold Highs Tuesday & Wednesday," 5 Sep. 2020 Let pie cool completely before serving to ensure that filling is firm and not runny. Xavier Cousens, WSJ, "Readers’ Favorite Summer Recipes," 4 Sep. 2020 The marmoreal cool of Debbie Harry and the band's razor-sharp duds plastered across TV screens helped define the nascent new wave genre, which would set the tone for many a mallrat's wardrobe. Billboard Staff, Billboard, "The 100 Greatest Music Video Artists of All Time: Staff List," 27 Aug. 2020 One day after breaking a record for heat Tuesday, Connecticut is in a mid-week cool down. Christine Dempsey, courant.com, "One day after breaking heat record, Connecticut wakes up to cooler weather. But a stormy Thursday looms," 26 Aug. 2020 Recent Examples on the Web: Adverb 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 Here, a pro pet stylist shares his best tips for keeping your dog cool all summer long. Grace Haynes, Southern Living, "Brush Up on Healthy Dog-Grooming Practices," 29 May 2020 Let cool slightly then chill, covered with plastic wrap, at least 3 hours. Taylor Murray, Country Living, "Fruit and Nut Trifle," 30 Oct. 2019 Let cool just slightly and serve warm or at room temperature. Kim Sunée, Anchorage Daily News, "Caramelized kimchi breadsticks are an absolute crowd pleaser," 20 Dec. 2019

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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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

20 Sep 2020

Cite this Entry

“Cool.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cool. Accessed 27 Sep. 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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