Usage History of 'doubtfully'

The following chart shows how frequently 'doubtfully' appeared in printed materials over time. For example, the word 'doubtfully' occurred 2 times in books in 1579 and 52,703 times in 2008. From 1579 to 2008, the word 'doubtfully' was used a total of 728,882 times in books scanned by Google. See Reference: Google Ngram project.

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