Definition of Cool

Noun

• great coolness and composure under strain
  "keep your cool"
  aplomb assuredness poise - sang froid
• the quality of being at a refreshingly low temperature
  "the cool of early morning"
  

Verb

• lose intensity
  "His enthusiasm cooled considerably"
  - cool off - cool down
• loose heat
  "The air cooled considerably after the thunderstorm"
  chill - cool down
• make cool or cooler
  "Chill the food"
  chill - cool down

Adjective

• fashionable and attractive at the time
  often skilled or socially adept
  "he's a cool dude"
  "that's cool"
  "Mary's dress is really cool"
  "it's not cool to arrive at a party too early"
  
• (used of a number or sum) without exaggeration or qualification
  "a cool million bucks"
  
• psychologically cool and unenthusiastic
  unfriendly or unresponsive or showing dislike
  "relations were cool and polite"
  "a cool reception"
  "cool to the idea of higher taxes"
  
• (color) inducing the impression of coolness
  used especially of greens and blues and violets
  "cool greens and blues and violets"
  
• marked by calm self-control (especially in trying circumstances)
  unemotional
  "play it cool"
  "keep cool"
  "stayed coolheaded in the crisis"
  "the most nerveless winner in the history of the tournament"
  coolheaded nerveless
• neither warm nor very cold
  giving relief from heat
  "a cool autumn day"
  "a cool room"
  "cool summer dresses"
  "cool drinks"
  "a cool breeze"
  

• Scrabble® score of the cool (6)
• Word Chums® score of the cool (10)
• Words With Friends® score of the cool (8)