English edit

Etymology edit

harmful +‎ -ness

Noun edit

harmfulness (countable and uncountable, plural harmfulnesses)

  1. The characteristic of being harmful.
    • 1922, Edith Wharton, chapter 8, in The Glimpses of the Moon:
      Once his word was pledged, he was safe: otherwise there was no limit to his capacity for wilful harmfulness.

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