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Noun: insidiousness  in'si-dee-us-nus
  1. Subtle and cumulative harmfulness (especially of a disease)
     
  2. The quality of being designed to entrap

Type of: harmfulness, injuriousness, perfidiousness, perfidy, treachery

Nearest

inside loop
inside out
Inside Passage
inside track
inside-out
insider
insider information
insider trading
insidious
insidiously
insidiousness
insight
insightful
insightfulness
insignia
insignia of rank
insignificance
insignificant
insignificantly
insincere
insincerely