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English definition of “cool”

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cool

adjective uk   /kuːl/ us  

cool adjective (COLD)

B1 slightly cold: cool water cool weatherB1 slightly cold in a pleasant way: It was a lovely cool evening. How do you manage to look so cool in this hot weather? used to describe a temperature that is slightly too cold: It's a bit cool in here, isn't it? I think I'll close the window.
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cool adjective (CALM)

C1 calm and not worried or frightened; not influenced by strong feeling of any kind: He was very cool and calm about the mishap, and didn't shout or lose his temper. Stay/Keep cool (= do not become angry or excited).be cool with sth informal to be happy to accept a situation or suggestion: Yeah, we could leave later - I'm cool with that.

cool adjective (COLOUR)

Cool colours, such as blue or green, make you feel calm and relaxed: The bedroom was painted a lovely cool blue.

cool adjective (UNFRIENDLY)

C2 unfriendly or not showing kindness or interest in something or someone: She was decidedly cool towards me. I got a rather cool reception/welcome this evening. What do you think I've done wrong?

cool adjective (FASHIONABLE)

A2 informal fashionable or attractive: Angie's got some cool new sunglasses. Now I know it won't look very cool, but this hat will keep the sun out of your eyes.

cool

adjective, exclamation uk   /kuːl/ informal us  
A2 excellent; very good: "So how was the concert?" "It was cool!" "Do you want to come with us?" "Yeah, cool!"
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cool

noun uk   /kuːl/ us  

cool noun (COLD)

the cool [S] the pleasant, slightly cold temperature of a place: He loved the cool of the early morning. She left the afternoon sun for the cool of the shade.

cool noun (CALM)

C1 [U] informal a person's ability to stay calm and not become angry or excited: keep your cool He really lost his cool when he heard about what happened.

cool

verb uk   /kuːl/ us  

cool verb (BECOME COLD)

B2 [I or T] to become or cause something to become slightly colder: Leave the cake to cool for an hour before cutting it. He took off his shoes to cool his sweaty feet.

cool verb (BECOME LESS)

[I] ( also cool off) If a feeling cools or cools off, it starts to become less strong: They were desperately in love to begin with, but I think it's starting to cool off now. Their interest in the project seems to be cooling. [I] ( also cool off) If the economy, a business, etc. cools or cools off, it grows less fast than before: The rise in share prices has cooled off.
Idioms
(Definition of cool from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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