\ 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: Verb Herders have been using these ice patches to let their reindeers rest and cool off for centuries. Megan Gannon, Smithsonian, "Archaeologists Race to Preserve Artifacts as the Ice Melts in Mongolia," 20 Nov. 2019 This pizza stone is designed to perfectly cook pizza and then transition seamlessly into a serving platter by cooling off quickly and not affecting the pizza's temperature. NBC News, "10 Black Friday-level kitchen tech deals — and an extra 15 percent off," 18 Nov. 2019 Transfer jars to a wire rack and let cool completely, then refrigerate until chilled, at least 2 1/2 hours and up to 2 days. Woman's Day Kitchen, Woman's Day, "Eggnog Pudding," 14 Nov. 2019 Don’t take our word for it: During the summer, two dozen free beaches double as the city’s living room, with locals and travelers coming to cool off, bike, and run—with friends, kids, and dogs in tow. Joseph Hernandez, Condé Nast Traveler, "Reader's Choice Awards: Why We Love Chicago, the Best Large City in America," 21 Oct. 2019 Peebles and his colleagues had predicted this background radiation, a result of when the universe, about 400,000 years after the Big Bang, cooled off enough for hydrogen and helium atoms to form. BostonGlobe.com, "“They really, sort of tell us something very essential — existential — about our place in the universe,” Ulf Danielsson, a member of the Nobel committee, said during an interview broadcast on the web.," 9 Oct. 2019 That superb run defense eventually helped Georgia cool off Maurer, who had passed for 209 yards in the first half as Tennessee grabbed a 14-10 lead. Steve Megargee, San Diego Union-Tribune, "No. 3 Georgia can handle adversity but wants to start faster," 6 Oct. 2019 Let cool five minutes before transferring to a wire rack, then let cool completely. Patrick Connolly, orlandosentinel.com, "Homemade Cookies Day: Celebrate with these three recipes," 30 Sep. 2019 Highs in the inland valleys will reach 90 on Sunday before cooling off slightly early next week, while temperatures near the foothills are expected to peak at 98 on Sunday. Ramona Sentinel, "Labor Day weekend expected to bring extreme heat to desert," 29 Aug. 2019 Recent Examples on the Web: Noun Let cool in the pan 10 minutes, then transfer to a wire rack set over a baking sheet to cool completely. Woman's Day Kitchen, Woman's Day, "Sticky Cranberry-Toffee Date Cake," 14 Nov. 2019 Don't lose your cool if there is heightened competition for a top spot. Tribune Content Agency, oregonlive, "Horoscope for Nov. 4, 2019: Gemini, your practical side is soaring; Scorpio, get back in the groove," 4 Nov. 2019 Let the pot pie cool for 10 minutes before serving. ExpressNews.com, "Wednesday Recipe: Cast-Iron Chicken Pot Pie," 28 Aug. 2019 Transfer to a wire rack and let the cool for 15 to 20 minutes before serving. Marcy Goldman, Twin Cities, "With less sugar, these cobblers, crisps and crumbles let their fruit flavors shine brighter," 15 Aug. 2019 Letting the oil cool, then straining and reusing it a few times, is economical and less wasteful. Olga Massov, The Denver Post, "Fry to greater heights with this crispy restaurant-worthy pork milanese," 8 Nov. 2019 Letting the oil cool, then straining and reusing it a few times, is economical and less wasteful. Olga Massov, chicagotribune.com, "Fry to greater heights with this crispy restaurant-worthy pork milanese," 6 Nov. 2019 Keep your room cool: The temperature should be somewhere around 68 to 69 degrees, which has been shown to be optimal for sleep. Breeanna Hare, CNN, "How you should spend that extra hour from Daylight Saving Time, for your health," 31 Oct. 2019 What’s cool is the audience always seems to have a good laugh at it. Brian Davids, The Hollywood Reporter, "'Zombieland' Director on Potential Zoey Deutch Spinoff and Favorite Deleted Scenes," 23 Oct. 2019 Recent Examples on the Web: Adverb Let cool completely, then cover and refrigerate for at least 8 hours and up to 48 hours to let the flavors mingle. The New York Times News Service Syndicate, The Denver Post, "A brilliant Thanksgiving strategy: Make sides quickly, or ahead," 25 Nov. 2019 Let cool completely, then transfer to each cupcake. The Good Housekeeping Test Kitchen, Good Housekeeping, "Spiderweb Cupcakes," 2 Aug. 2019 On-shore winds from the lake have been keeping things cool around Milwaukee the past few days. Joe Taschler, Milwaukee Journal Sentinel, "Summer set to return in time for Father's Day," 12 June 2018 Let cool slightly before putting in a serving bowl to shape (see photo). Josie Sexton, The Know, "From peach foie gras to boozy slushies, 20 ways to eat peaches at Denver restaurants right now," 28 Aug. 2019 Fortunately, our ancestors knew a thing or two about staying cool even without electricity. WSJ, "How We Kept Cool Before Air Conditioning," 20 June 2019 Let cool slightly, then chop the eggplant into 1-inch pieces. Christopher Kimball, BostonGlobe.com, "Three recipes that bring out the deep flavors of eggplant," 7 Aug. 2019 Look cool in a loose-fitting camp-collar shirt with a bold summer pattern. David Syrek, chicagotribune.com, "Lollapalooza no-stress style guide for guys," 21 July 2019 Let cool; finely crush with the side of a chef’s knife. Andy Baraghani, Bon Appetit, "Spinach-Yogurt Dip with Sizzled Mint," 19 Mar. 2018

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

Cite this Entry

“Cool.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/coolly. Accessed 5 December 2019.

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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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More from Merriam-Webster on cool

Thesaurus: All synonyms and antonyms for cool

Rhyming Dictionary: Words that rhyme with cool

Spanish Central: Translation of cool

Nglish: Translation of cool for Spanish Speakers

Britannica English: Translation of cool for Arabic Speakers

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