Usage History of 'regretfully'

The following chart shows how frequently 'regretfully' appeared in printed materials over time. For example, the word 'regretfully' occurred 2 times in books in 1649 and 31,875 times in 2008. From 1649 to 2008, the word 'regretfully' was used a total of 599,651 times in books scanned by Google. See Reference: Google Ngram project.

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