Usage History of 'coolheaded'

The following chart shows how frequently 'coolheaded' appeared in printed materials over time. For example, the word 'coolheaded' occurred 2 times in books in 1766 and 915 times in 2008. From 1766 to 2008, the word 'coolheaded' was used a total of 18,142 times in books scanned by Google. See Reference: Google Ngram project.

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