Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun insidiousness

2 senses of insidiousness

Sense 1
insidiousness -- (subtle and cumulative harmfulness (especially of a disease))
       => harmfulness, injuriousness -- (destructiveness that causes harm or injury)

Sense 2
insidiousness -- (the quality of being designed to entrap)
       => perfidy, perfidiousness, treachery -- (betrayal of a trust)