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noun
Subtle and cumulative harmfulness (especially of a disease).
is a specific kind of: harmfulness, injuriousness.
derivation: insidious, pernicious, subtle.
The quality of being designed to entrap.
is a specific kind of: perfidiousness, perfidy, treachery.
derivation: insidious | insidious.
Polish: podstępność
Find more on insidiousness elsewhere: etymology - rhymes - Wikipedia.
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