\ 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 Meanwhile, year-over-year growth in private-sector payrolls has cooled. WSJ, "Jobs Report Could Show Signs of Weakening Economic Momentum," 7 Feb. 2020 Biotech stocks cooled off after the Federal Reserve and politicians called out excesses in that sector. Matt Egan, CNN, "Tesla's insane rally already rivals some of the biggest bubbles in recent history," 7 Feb. 2020 Since then, though, market reaction has cooled (see chart). The Economist, "Knocking off work Traders lose interest in America’s jobs report," 6 Feb. 2020 Yesterday’s record warmth was the pinnacle of this week’s spring preview, as clouds and rain dampen the situation today, and then temperatures cool back later tonight into tomorrow. Matt Rogers, Washington Post, "D.C.-area forecast: Mild today as we kick off a rainy streak, then turning colder tomorrow," 4 Feb. 2020 This hot plasma then cools slightly and sinks back below the surface of the Sun. Eric Berger, Ars Technica, "We are entering the Golden Age of studying our Sun," 1 Feb. 2020 But by the end of the year, his momentum had cooled. cleveland, "Pete Buttigieg is on the attack in Iowa," 1 Feb. 2020 This primordial substance once shone white-hot, then cooled to a light orange over the universe’s first few hundred thousand years. Quanta Magazine, "How Ancient Light Reveals the Universe’s Contents," 28 Jan. 2020 Most basic consumer desktop PCs CPUs are cooled using blocks of aluminum with extruded fins to increase surface area. Gordon Mah Ung, PCWorld, "IceGiant says its giant cooler can even tame AMD's giant Threadripper," 27 Jan. 2020 Recent Examples on the Web: Noun Every once in a while, our detectives lose their cool. Nick Martin, The New Republic, "Bingeing on Cop Propaganda," 28 Jan. 2020 Edmondson said Gentry has a good temperament and doesn't lose her cool when others do. Julia Fair, The Courier-Journal, "Kentucky judge Dawn Gentry suspension hearing: 5 crazy moments and what's up next," 9 Jan. 2020 Tristan Thompson lost his cool in December, shouting at Beilein before apologizing shortly after. Chris Fedor, cleveland, "Kevin Porter Jr.'s knee injury stalls rapid ascension: ‘It hurt my heart a little bit, he was looking like the steal of draft’," 6 Jan. 2020 Few can blame Kerr, who infamously got bloodied shattering a clipboard against the Bulls last month, for losing his cool. Connor Letourneau, SFChronicle.com, "Ugly third quarter dooms Warriors in blowout loss to Kings," 15 Dec. 2019 Remove from oven and let cool for 10 minutes before serving. Nik Sharma, SFChronicle.com, "A sheet-pan chicken dinner that bastes itself," 27 Dec. 2019 After every particularly brutal battle, the game is wise enough to drop an accordion-squeeze cool-down of traversal and simpler combat before ramping things up again. Ars Staff, Ars Technica, "Ars Technica’s best games of 2019," 24 Dec. 2019 The leaves are turning colors and the air is growing cool. Lois Szymanski, baltimoresun.com/maryland/carroll, "Central Carroll: Corn Maze returning to Ag Center, this year with a moon landing theme," 24 Sep. 2019 Tony was a cool, down-to-earth guy who made the process painless. Michael Gonzales, Longreads, "It’s Like That: The Makings of a Hip-Hop Writer," 10 June 2019 Recent Examples on the Web: Adverb Let cool slightly before serving as is, or with a dollop of Greek yogurt. Ellie Krieger, The Denver Post, "Roasting fall fruit deepens their flavor and nourishes the senses," 1 Oct. 2019 Let cool completely, then pulverize in a food processor until finely ground. Nancy Stohs, Milwaukee Journal Sentinel, "14 Holiday Cookie Contest winning recipes, ahead of this year's Dec. 4 reveal," 29 Nov. 2019 Let cool completely, about 30 minutes, then break into individual cookies. Woman's Day Kitchen, Woman's Day, "Evan Rachel Wood’s Gluten-Free Shortbread," 21 Nov. 2019 Transfer to cutting board; let cool before slicing. The Good Housekeeping Test Kitchen, Good Housekeeping, "Chicken, Sausage and White Bean Stew," 21 Dec. 2019 Let cool slightly before serving as is, or with a dollop of Greek yogurt. Ellie Krieger, The Denver Post, "Roasting fall fruit deepens their flavor and nourishes the senses," 1 Oct. 2019 Let cool slightly, cover, and chill in refrigerator at least 6 hours and up to overnight. Kim Sunée, Anchorage Daily News, "Toasted black sesame seeds give this Italian classic a nuttier flavor," 6 Dec. 2019 Let cool a few minutes on sheets, then remove to wire rack to cool completely. Nancy Stohs, Milwaukee Journal Sentinel, "Orange Almond Ricotta Cookies," 3 Dec. 2019 Let cool slightly before serving as is, or with a dollop of Greek yogurt. Ellie Krieger, The Denver Post, "Roasting fall fruit deepens their flavor and nourishes the senses," 1 Oct. 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

Cite this Entry

“Cool.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/coolish. Accessed 18 Feb. 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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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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