coolest

adjective

1. 1

   Having a slightly low temperature; mildly or pleasantly cold.

2. 2

   Allowing or suggesting heat relief.

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

3. 3

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

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

4. 4

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

5. 5

   Unenthusiastic, lukewarm, skeptical.

   “His proposals had a cool reception.”

6. 6

   Calmly audacious.

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

7. 7

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

8. 8

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

9. 9

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

10. 10

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

    “Is it cool if I sleep here tonight?”

11. 11

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

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

12. 12

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