Usage History of 'impassably'

The following chart shows how frequently 'impassably' appeared in printed materials over time. For example, the word 'impassably' occurred 4 times in books in 1760 and 308 times in 2008. From 1760 to 2008, the word 'impassably' was used a total of 5,069 times in books scanned by Google. See Reference: Google Ngram project.

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