Noun harmfulness has 2 senses
  1. harmfulness, injuriousness - destructiveness that causes harm or injury
    --1 is a kind of destructiveness
    --1 has particulars: insidiousness; virulence, virulency
  2. harmfulness, noisomeness, noxiousness - the quality of being noxious
    --2 is a kind of unwholesomeness, morbidness, morbidity
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