Usage History of 'impassible'

The following chart shows how frequently 'impassible' appeared in printed materials over time. For example, the word 'impassible' occurred 2 times in books in 1629 and 8,208 times in 2008. From 1629 to 2008, the word 'impassible' was used a total of 138,703 times in books scanned by Google. See Reference: Google Ngram project.

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