Usage History of 'doubtful'

The following chart shows how frequently 'doubtful' appeared in printed materials over time. For example, the word 'doubtful' occurred 2 times in books in 1505 and 453,114 times in 2008. From 1505 to 2008, the word 'doubtful' was used a total of 12,961,250 times in books scanned by Google. See Reference: Google Ngram project.

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