\ 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 Now that the weather is starting to cool, however, their fling is still going strong, and with every passing day the rumored couple is getting more public. Carolyn Twersky, Seventeen, "Shawn Mendes and Camila Cabello Posted a Video Making Out With a Whole Lot of Tongue on Instagram and I’m SHOOK," 12 Sep. 2019 Mantua said the lack of wind this summer has limited upwelling of nutrient-rich waters, which tends to cool off surface temperatures. Peter Fimrite, SFChronicle.com, "‘Blob’ of warm Pacific water is back — could be trouble for marine life and weather," 10 Sep. 2019 These classes can give you the opportunity to cool off as well as burn hundreds of calories. Stephanie Mansour, NBC News, "5 tips for exercising outdoors in warm weather," 9 Sep. 2019 Taking a dip in Lake Michigan to cool off, if the temperature tops out around 86 degrees as expected in Milwaukee on Tuesday, might not be a good idea. Joe Taschler, Milwaukee Journal Sentinel, "Dangerous swim conditions expected along Lake Michigan as temperatures rise to mid-80s on Tuesday," 9 Sep. 2019 Beyond the music, fans got to cool off at the Kia Soul Station human car wash experience and were treated to a fantastic viewing deck with a meet & greet with Above & Beyond. Taylor Mims, Billboard, "Electric Zoo Welcomed Over 107,000 Fans to Randall's Island Park," 4 Sep. 2019 Lynch said his housemates would jump into the mucky pond with life rafts to cool off on hot days. Shannon Ryan, chicagotribune.com, "Welcome to the ‘Lake House’, where at least 23 Northern Illinois football players have lived since 2010: ‘We still get Jordan Lynch’s mail’," 26 Aug. 2019 Temperatures were expected to hit 101 degrees in Dallas on Monday and were forecast to climb even higher on Tuesday afternoon before cooling off. Bloomberg Wire, Dallas News, "Searing heat sends Texas electricity prices to scorching $6,500 a megawatt hour," 12 Aug. 2019 Under Mr Juncker’s new rules, this cooling-off period has been extended to two years for commissioners and three for the president. The Economist, "A consulting firm founded by an outgoing commissioner tests the rules," 8 Aug. 2019 Recent Examples on the Web: Noun Judge Greg Mathis reportedly lost his cool while out to dinner on Friday night. Claudia Harmata, PEOPLE.com, "Judge Mathis Spit in Valet Driver’s Face Because He Took Too Long to Get His Rolls-Royce: Report," 28 Aug. 2019 Even warm breezes carry an edge of cool as a reminder of the latitude, and restaurants with outdoor seating offer heat lamps and blankets. Alli Harvey, Anchorage Daily News, "Bursting with joy over vast landscapes, extensive bike trails and time to enjoy them," 12 Sep. 2019 Wind down on Pub Street, Siem Reap’s center of cool, for a hearty lunch at French bakery and café Blue Pumpkin, a large, sunny joint known for cakes, sorbets, and ice creams. Kareena Gianani, National Geographic, "Explore Cambodia’s ancient stone city," 10 Sep. 2019 Jennifer Aniston is pretty much the epitome of California cool. Abby Gardner, Allure, "Jennifer Aniston Swears By This $195 Gold Face-Sculpting Tool," 6 Sep. 2019 Jennifer Aniston is pretty much the epitome of California cool. Abby Gardner, Glamour, "Jennifer Aniston Swears By This Gold Face-Sculpting Tool," 4 Sep. 2019 Image isn’t everything Van Wagenen, excepting his chair-throwing fit in a coaches’ meeting last week, seems an exemplar of California cool. New York Times, "What Brodie Van Wagenen Can Learn From the Architect of the ’69 Mets," 22 July 2019 My dad played there in college, so that’s kind of cool, but I really like their coaching staff. Zach Osterman, Indianapolis Star, "Basketball recruiting: Purdue keeps an eye on Minnesota forward Ben Carlson," 12 July 2019 For one girl, a picture of the master of cool actually appeared outside of her social media feeds. Time, "Casual Mother Reveals She Went to High School With Keanu Reeves and Has a Yearbook to Prove It," 10 July 2019 Recent Examples on the Web: Adverb 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 Let cool Make Pie Dough Pastry: In food processor, blend flour and salt. Good Housekeeping, "Onion Goat Cheese Tart," 29 July 2015

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

Statistics for cool

Last Updated

17 Sep 2019

Time Traveler for cool

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

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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

Comments on cool

What made you want to look up cool? Please tell us where you read or heard it (including the quote, if possible).


a calculated move

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