Usage History of 'underactive'

The following chart shows how frequently 'underactive' appeared in printed materials over time. For example, the word 'underactive' occurred 6 times in books in 1877 and 2,024 times in 2008. From 1877 to 2008, the word 'underactive' was used a total of 49,362 times in books scanned by Google. See Reference: Google Ngram project.

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