Usage History of 'unimpeachably'

The following chart shows how frequently 'unimpeachably' appeared in printed materials over time. For example, the word 'unimpeachably' occurred 4 times in books in 1791 and 830 times in 2008. From 1791 to 2008, the word 'unimpeachably' was used a total of 20,361 times in books scanned by Google. See Reference: Google Ngram project.

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