Cool

chouette

(colloquial: being considered as "popular" by others)

cool

(colloquial: in fashion)

cool

(colloquial: all right, acceptable)

frais

(having a slightly low temperature)

calme

(calm temperament)

frais

(moderate temperature)

sang-froid

(calm temperament)

rafraichir

(to make colder (literally))

refroidir

(to make colder (literally))