Usage History of 'doubtless'

The following chart shows how frequently 'doubtless' appeared in printed materials over time. For example, the word 'doubtless' occurred 8 times in books in 1505 and 611,914 times in 2008. From 1505 to 2008, the word 'doubtless' was used a total of 14,142,769 times in books scanned by Google. See Reference: Google Ngram project.

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