cool cool /ˈkuːl/

adjective

1. () Neither warm nor very cold; giving relief from heat  ( cool )
   neither warm nor very cold; giving relief from heat
    A cool autumn day
   a cool autumn day
    A cool room
   a cool room
    Cool summer dresses
   cool summer dresses
    Cool drinks
   cool drinks
    A cool breeze
   a cool breeze
   
2. () Marked by calm self-control (especially in trying circumstances); unemotional  ( coolheaded , nerveless , cool )
   marked by calm self-control (especially in trying circumstances); unemotional
    Play it cool
   play it cool
    Keep cool
   keep cool
    Stayed coolheaded in the crisis
   stayed coolheaded in the crisis
    The most nerveless winner in the history of the tournament
   the most nerveless winner in the history of the tournament
   
3. [Informal] Fashionable and attractive at the time; often skilled or socially adept  ( cool [Informal] )
   fashionable and attractive at the time; often skilled or socially adept
    He's a cool dude
   he's a cool dude
    That's cool
   that's cool
    Mary's dress is really cool
   Mary's dress is really cool
    It's not cool to arrive at a party too early
   it's not cool to arrive at a party too early
   
4. [Informal] Used of a quantity or amount (especially of money) for emphasis  ( cool [Informal] )
   used of a quantity or amount (especially of money) for emphasis
    A cool million bucks
   a cool million bucks
   
5. [Informal] Being satisfactory or in satisfactory condition  ( cool [Informal] , hunky-dory [Informal] , ok , all right , fine , o.k. , okay , jake [Informal, N. American, Australian, New Zeland] )
   being satisfactory or in satisfactory condition
    An all-right movie
   an all-right movie
    The passengers were shaken up but are all right
   the passengers were shaken up but are all right
    Is everything all right?
   is everything all right?
    Everything's fine
   everything's fine
    Things are okay
   things are okay
    Dinner and the movies had been fine
   dinner and the movies had been fine
    Another minute I'd have been fine
   another minute I'd have been fine
   
6. Psychologically cool and unenthusiastic; unfriendly, unresponsive or showing dislike  ( cool )
   psychologically cool and unenthusiastic; unfriendly, unresponsive or showing dislike
    Relations were cool and polite
   relations were cool and polite
    A cool reception
   a cool reception
    Cool to the idea of higher taxes
   cool to the idea of higher taxes
   
7. Inducing the impression of coolness; used especially of greens and blues and violets when referring to color  ( cool )
   inducing the impression of coolness; used especially of greens and blues and violets when referring to color
    Cool greens and blues and violets
   cool greens and blues and violets
    The cool sound of rushing water
   the cool sound of rushing water
   

noun

1. Great coolness and composure under strain  ( assuredness , cool , poise , aplomb , sang-froid , sangfroid )
   great coolness and composure under strain
    Keep your cool
   keep your cool
   
   
2. The quality of being at a refreshingly low temperature  ( cool )
   the quality of being at a refreshingly low temperature
    The cool of early morning
   the cool of early morning
   

verb

1. () Make cool or cooler  ( cool down , chill , cool )
   make cool or cooler
    Chill the food
   Chill the food
   
2. () Loose heat  ( chill , cool down , cool )
   loose heat
    The air cooled considerably after the thunderstorm
   The air cooled considerably after the thunderstorm
   
3. Lose intensity  ( cool , cool down , cool off )
   lose intensity
    His enthusiasm cooled considerably
   His enthusiasm cooled considerably