Coolest

adjective

1. neither warm nor very cold; giving relief from heat

   “a cool autumn day”

2. marked by calm self-control (especially in trying circumstances); unemotional

   “play it cool”

   Synonymscoolheadednerveless

3. inducing the impression of coolness; used especially of greens and blues and violets when referring to color

   “cool greens and blues and violets”

4. psychologically cool and unenthusiastic; unfriendly or unresponsive or showing dislike

   “relations were cool and polite”

5. being satisfactory or in satisfactory condition

   “an all-right movie”

   Synonymsall rightfineokokay

6. used of a quantity or amount (especially of money) for emphasis

   “a cool million bucks”