Usage History of 'unopenable'

The following chart shows how frequently 'unopenable' appeared in printed materials over time. For example, the word 'unopenable' occurred 4 times in books in 1832 and 100 times in 2008. From 1832 to 2008, the word 'unopenable' was used a total of 3,011 times in books scanned by Google. See Reference: Google Ngram project.

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