Language: Old English
Origin: col


1 adjective
cool1 W3 comparative cooler, superlative coolest


low in temperature, but not cold, often in a way that feels pleasant:
She swam out into the cool water.
The evening air was cool.
Relax in the sun with a cool drink.
the cooler weather of September


clothing that is cool is made of thin material so that you do not become too hot:
a cool cotton dress


calm and not nervous, upset, or excited
keep/stay cool
his ability to keep cool in a crisis
She looks efficient and as cool as a cucumber.
Outwardly she is cool, calm and collected.
a cool customer (=someone who always behaves calmly)
Keep a cool head (=stay calm).


informal very attractive, fashionable, interesting etc in a way that people admire - used in order to show approval:
She's pretty cool.
You look cool in denim.
Cool bike!
'I'm thinking of studying abroad.' 'Really? Cool.'


spoken used to say that you agree with something, that you understand it, or that it does not annoy you:
OK, Ryan, that's cool, I can do it.
'I just have to go, you know.' 'It's all right, it's cool.'
'I'm finished.' 'Cool.'
cool about
My mum was cool about whatever I wore.
something is cool with somebody
Is Friday cool with you guys?
somebody is cool with something
'Do you want to come over and watch a video tonight?' 'I'm cool with that.'

not friendly

behaving in a way that is not as friendly as you expect:
My proposal met with a cool response.
Luke gave her a cool look.


CC a cool colour is one, such as blue or green, that makes you think of cool things

a cool million/hundred thousand etc

informal a surprisingly large amount of money:
He earns a cool half million every year.
coolness noun [uncountable]
the coolness of the nights
coolly adverb:
She nodded coolly and walked out.

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