cool·head·ed /ˈkulˌhɛdɪd/
cool-head·ed, cool·head·ed a. Having a temper not easily excited; free from passion; unshakably calm and collected. -- Cool-head*ed*ness, n.
Syn: -- cool, imperturbable, unflappable.
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coolheaded
adj : marked by calm self-control (especially in trying
circumstances); unemotional; "play it cool"; "keep
cool"; "stayed coolheaded in the crisis"; "the most
nerveless winner in the history of the tournament"
[syn: cool, nerveless]