FluentPlex

cool

/kul/ adjective A1
  1. Of a mildly low temperature. · I like cool weather the most 'cause it's not too hot to wear a jacket but I won't be too cold in my shorts.
  2. Allowing or suggesting heat relief. · Linen has made cool and breathable clothing for millennia.
  3. Of a color, in the range of violet to green. · If you have a reddish complexion, you should mainly wear cool colors.
  4. Not showing emotion; calm and in control of oneself. · Be cool. There's no need to panic.
  5. Unenthusiastic; lukewarm; skeptical. · His proposals had a cool reception.
  6. Applied facetiously to a sum of money, commonly as if to give emphasis to the largeness of the amount.
  7. Knowing what to do and how to behave; behaving with effortless and enviable style and panache; considered popular by others. (informal)
  8. Fashionable; trendy; hip. (informal)

Comparative cooler · Superlative coolest

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From the library

The schoolhouse was set back from the road and behind it was a dusky fir wood and a brook where all the children put their bottles of milk in the morning to keep cool and sweet until dinner hour.
Anne of Green Gables, p. 107 · C1
Depend upon it, Marilla, she’ll cool off in a week or so and be ready enough to go back of her own accord, that’s what, while, if you were to make her go back right off, dear knows what freak or tantrum she’d take next and make more trouble than ever.
Anne of Green Gables, p. 122 · C1
Then I made inquiries as to this mysterious assistant and found that I had to deal with one of the coolest and most daring criminals in London.
The Adventures of Sherlock Holmes, p. 32 · B2
Then she went back to the house, and having helped herself and Toto to a good drink of the cool, clear water, she set about making ready for the journey to the City of Emeralds.
The Wonderful Wizard of Oz, p. 12 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.