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Alternative forms


Etymology 1

From Middle English, from Old English cōl (cool, cold, tranquil, calm), from Proto-Germanic *kōlaz, *kōlijaz (cool), from Proto-Indo-European *gelǝ- (cold). Cognate with Dutch koel (cool), German kühl (cool). Related to cold.


cool (comparative cooler, superlative coolest)

  1. Having a slightly low temperature; mildly or pleasantly cold.
    • 1898, Winston Churchill, chapter 8, The Celebrity:
      The day was cool and snappy for August, and the Rise all green with a lavish nature. Now we plunged into a deep shade with the boughs lacing each other overhead, and crossed dainty, rustic bridges over the cold trout-streams, the boards giving back the clatter of our horses' feet: [] .
  2. Allowing or suggesting heat relief.
    a cool grey colour
    • 1963, Margery Allingham, chapter 2, The China Governess[1]:
      Now that she had rested and had fed from the luncheon tray Mrs. Broome had just removed, she had reverted to her normal gaiety.  She looked cool in a grey tailored cotton dress with a terracotta scarf and shoes and her hair a black silk helmet.
  3. Of a person, not showing emotion, calm and in self-control.
  4. Unenthusiastic, lukewarm, skeptical.
    His proposals had a cool reception.
  5. Calmly audacious.
    In control as always, he came up with a cool plan.
    • Nathaniel Hawthorne (1804-1864)
      Its cool stare of familiarity was intolerable.
    • 1944 November 28, Irving Brecher and Fred F. Finklehoffe, Meet Me in St. Louis, Metro-Goldwyn-Mayer:
      My father was talking to the World's Fair Commission yesterday, and they estimate it's going to cost a cool fifty million.
  6. (informal) Of a person, knowing what to do and how to behave; considered popular by others.
  7. (informal) In fashion, part of or fitting the in crowd; originally hipster slang.
    • 2008, Lou Schuler, "Foreward", in Nate Green, Built for Show, page xii
      The fact that I was middle-aged, bald, married, and raising girls instead of chasing them didn't really bother me. Muscles are cool at any age.
  8. (informal) Of an action, all right; acceptable; that does not present a problem.
    Is it cool if I sleep here tonight?
  9. (informal) A dismissal of a comment perceived as boring or pointless.
    Ok, that's cool man, but I don't care.
    Cool story bro.
  10. (informal) Of a person, not upset by circumstances that might ordinarily be upsetting.
    I'm completely cool about my girlfriend leaving me.
  11. Applied facetiously to a sum of money, commonly as if to give emphasis to the largeness of the amount.
Derived terms
  • ^  The earliest use of the word in this way seems to be in Wilkie Collins' "The Moonstone" 1868:
    "She has been a guest of yours at this house," I answered. "May I venture to suggest — if nothing was said about me beforehand — that I might see her here?"
    "Cool!" said Mr. Bruff. With that one word of comment on the reply that I had made to him, he took another turn up and down the room.
    "In plain English," he said, "my house is to be turned into a trap to catch Rachel ...
  • In 1602, Shakespeare wrote that Queen Gertrude told Hamlet:
    "O gentle son, Upon the heat and flame of thy distemper, Sprinkle cool patience."
The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Help:How to check translations.


cool (uncountable)

  1. A moderate or refreshing state of cold; moderate temperature of the air between hot and cold; coolness.
    in the cool of the morning
  2. A calm temperament.

Etymology 2

From Middle English colen, from Old English cōlian (to cool, grow cold, be cold), from Proto-Germanic *kōlēną (to become cold), from Proto-Indo-European *gel- (to freeze). Cognate with Dutch koelen (to cool), German kühlen (to cool), Swedish, häftig (cool)kyla (to cool, refrigerate). Also partially from Middle English kelen, from Old English cēlan (to cool, be cold, become cold), from Proto-Germanic *kōlijaną (to cool), altered to resemble the adjective cool. See keel.


cool (third-person singular simple present cools, present participle cooling, simple past and past participle cooled)

  1. (literally intransitive) To lose heat, to get colder.
    I like to let my tea cool before drinking it so I don't burn my tongue.
  2. (transitive) To make cooler, less warm
    • Bible, Luke xvi. 24
      Send Lazarus, that he may dip the tip of his finger in water, and cool my tongue.
  3. (figuratively, intransitive) To become less intense, e.g. less amicable or passionate.
    Relations cooled between the USA and the USSR after 1980.
  4. (transitive) To make less intense, e.g. less amicable or passionate.
    • Shakespeare
      We have reason to cool our raging motions, our carnal stings, our unbitted lusts.
Derived terms




Germanic, from English cool, a cognate.



cool (comparative cooler, superlative coolst)

  1. cool, fashionable




From English cool.



cool m, f

  1. cool (only its informal senses, mainly fashionable)
    Les jeunes sont cool.
    Young people are cool.
    Les jeunes boivent de l'alcool pour être cool.
    Young people drink alcohol to be cool.



  1. cool! great!