"coolheaded." YourDictionary, n.d. Web. 07 December 2018. <https://www.yourdictionary.com/coolheaded>.
coolheaded. (n.d.). Retrieved December 07th, 2018, from https://www.yourdictionary.com/coolheaded
(comparative more coolheaded, superlative most coolheaded)
From cool + head + -ed, thus "having a cool head."
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