Usage History of 'unflappable'

The following chart shows how frequently 'unflappable' appeared in printed materials over time. For example, the word 'unflappable' occurred 4 times in books in 1873 and 5,146 times in 2008. From 1873 to 2008, the word 'unflappable' was used a total of 86,322 times in books scanned by Google. See Reference: Google Ngram project.

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