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