Usage History of 'unflagging'

The following chart shows how frequently 'unflagging' appeared in printed materials over time. For example, the word 'unflagging' occurred 2 times in books in 1620 and 13,611 times in 2008. From 1620 to 2008, the word 'unflagging' was used a total of 328,833 times in books scanned by Google. See Reference: Google Ngram project.

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