Usage History of 'thoughtless'

The following chart shows how frequently 'thoughtless' appeared in printed materials over time. For example, the word 'thoughtless' occurred 4 times in books in 1563 and 77,648 times in 2008. From 1563 to 2008, the word 'thoughtless' was used a total of 1,367,448 times in books scanned by Google. See Reference: Google Ngram project.

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