cool [kuːl], cool·er, the cool·est
 Having a slightly low temperature
 Of a person, knowing what to do and how to behave; considered popular by others
 In fashion, part of or fitting the in crowd; originally hipster slang
chilly, distant, phlegmatic, standoffish, unemotional, à la mode, fashionable, in fashion, modish, stylish, happening, hip, in, trendy, acceptable, all right, OK, easy, fine, not bothered, not fussed
• Unlike you, I am cool.
• That's a cool pencil case Lynn has there!
• I listen to cool music exclusively.