adjective

cool

cool, calm, fashionable, stylish

It's a cool day today.

It's a cool day today.

She has a really cool car.

She has a really cool car.

Stay cool, don't get angry.

Stay cool, don't get angry.

((be)) cool used to describe temperature or a state. The weather is cool today.

((a)) cool ((noun)) used to describe something as fashionable or good. That's a cool jacket.

Synonyms: chilly (temperature); awesome, neat (slang); calm, composed (temperament). Antonyms: warm, hot; lame; agitated.

From Old English 'cōl', related to 'cold'. The slang meaning 'fashionable' developed in the jazz scene of the 1940s.

Think of how a cool temperature can be calming and pleasant, which extends to the idea of a 'cool' person or a 'cool' style.

This page is designed for learning support. Please use it as a learning reference, not as a formal reference.