cool in WordNet English dictionary

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

1. loose heat
   "The air cooled considerably after the thunderstorm"
   cool  chill  cool down 
   
2. make cool or cooler
   "Chill the food"
   cool  chill  cool down 
   
3. lose intensity
   "His enthusiasm cooled considerably"
   cool  cool off  cool down 
   

1. neither warm nor very cold; giving relief from heat
   "a cool autumn day"; "a cool room"; "cool summer dresses"; "cool drinks"; "a cool breeze"
   cool 
   
2. 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"
   cool 
   
3. (color) inducing the impression of coolness; used especially of greens and blues and violets
   "cool greens and blues and violets"
   cool 
   
4. 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"
   cool  coolheaded  nerveless 
   
5. 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"
   cool 
   
6. (used of a number or sum) without exaggeration or qualification
   "a cool million bucks"
   cool