Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “cool”

See all translations

cool

adjective

cool adjective (COLD)

   /kul/ [-er/-est only] slightly cold; of a low temperature: a cool evening/breeze Cereals should be stored in a cool, dry place.

cool adjective (UNFRIENDLY)

   /kul/ [-er/-est only] unfriendly or not showing affection or interest in something or someone: "Well, that’s just too bad," Bill replied in a cool tone.

cool adjective (CALM)

   /kul/ [-er/-est only] calm and not anxious or frightened: What’s needed now is calm, cool thinking. He made a cool assessment of the situation.

cool adjective (GOOD)

   /kul/ [-er/-est only] infml excellent; very good: It’s way cool to see you again!    /kul/ [-er/-est only] infml Cool is also used to show agreement with or acceptance of what someone says: "He wants to come with us." "Cool."

cool adjective (COLORS)

art /kul/ (of colors) not very bright or dark, and esp. containing green, blue, or gray
Idioms

cool

noun [U]  /kul/ us  

cool noun [U] (CALM)

infml the ability to stay calm and not get upset or angry: He’s gone swimming with sharks without losing his cool.

cool

verb [I/T]  /kul/ us  

cool verb [I/T] (COLD)

to lose heat or cause someone or something to lose heat: [I] Remove the pie from the oven and let it cool for 30 minutes. [I/T] He jumped into the pool to cool (himself) off.

cool verb [I/T] (CALM)

to (cause to) become calm or weaker in feeling: [I] We need to allow time for tempers to cool. [T] I wish Casey would cool his enthusiasm for video games.
(Definition of cool from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of cool?
Add Cambridge dictionaries to your browser to your website

Definitions of “cool” in other dictionaries

Word of the Day

escapism

a way of avoiding an unpleasant or boring life, especially by thinking, reading, etc. about more exciting but impossible activities

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

showrooming noun

February 23, 2015
the activity of examining a product in a physical store and then making the purchase with an online retailer Amazon’s new smartphone is specifically designed to make showrooming fast and easy.

Read More