1. adjective /kuːl/
His proposals had a cool reception.
b) Allowing or suggesting heat relief
In control as always, he came up with a cool plan.
Syn: chilly, distant, phlegmatic, standoffish, unemotional, à la mode, fashionable, in fashion, modish, stylish, happening, hip, in, trendy, acceptable, all right, OK, easy, fine, bothered, fussed
Ant: lukewarm, tepid, warm, passionate, awkward, uncool, démodé, old hat, out, fashion, not cricket, not on, unacceptable, bothered, upset
2. verb /kuːl/
a) To lose heat, to get colder.
I like to let my tea cool before drinking it so I dont burn by tongue.
b) To make cooler, less warm
Relations cooled between the USA and the USSR after 1980.
Wikipedia foundation.