(adj) marked by calm self-control (especially in trying circumstances); unemotional, Syn. coolheaded, nerveless, Example:play it cool; keep cool; stayed coolheaded in the crisis; the most nerveless winner in the history of the tournament
(adv) in a composed and unconcerned manner, Syn. nonchalantly, nervelessly, Example:without more ado Barker borrowed a knife from his brigade Major and honed it on a carborundum stone as coolly as a butcher