coolest

Having a slightly low temperature; mildly or pleasantly cold.

Allowing or suggesting heat relief.

“Linen has made cool and breathable clothing for millennia.”

Of a color, in the range of violet to green.

“If you have a reddish complexion, you should mainly wear cool colors.”

Of a person, not showing emotion; calm and in control of oneself.

Unenthusiastic, lukewarm, skeptical.

“His proposals had a cool reception.”

Calmly audacious.

“In control as always, he came up with a cool plan.”

Applied facetiously to a sum of money, commonly as if to give emphasis to the largeness of the amount.

Of a person, knowing what to do and how to behave; considered popular by others.

In fashion, part of or fitting the in crowd; originally hipster slang.

Of an action, all right; acceptable; that does not present a problem.

“Is it cool if I sleep here tonight?”

Of a person, not upset by circumstances that might ordinarily be upsetting.

“I'm completely cool with my girlfriend leaving me.”

Quietly impudent, defiant, or selfish; deliberately presuming: said of persons and acts.