of or at a fairly low temperature

it'll be a cool afternoon

the wind kept them cool

showing no friendliness towards a person or enthusiasm for an idea or project

he gave a cool reception to the suggestion for a research centre

fashionably attractive or impressive

he made no concessions to fashion, yet somehow he was hip and cool

I always wore sunglasses to look cool

used to emphasize the size of an amount of money

research for a new drug can cost a cool £50 million

a fairly low temperature

the cool of the night air

calmness; composure

he recovered his cool and then started laughing at us

the quality of being fashionably attractive or impressive

all the cool of high fashion

become or make less hot

we dived into the river to cool off

cool the pastry for five minutes