moderately cold; lacking in warmth

bringing or suggesting relief from heat

a cool dress

lacking friendliness or enthusiasm

dispassionately calm and self-controlled

said of a colour: producing an impression of being cool

informal used as an intensive

made a cool million

informal fashionable or attractive

informal very good

a cool idea

said of jazz: in a restrained melodic style popular in the 1940s

to make or become cool

to lose heat or warmth

to lose enthusiasm or passion

(often + off/down) to make (something or somebody) cool or cooler

to moderate the excitement, force, or activity of (something, e.g. somebody's temper)

a cool atmosphere or place

informal poise or composure

Don't lose your cool

informal the quality of being impressively fashionable or attractive