Noun
the quality of being designed to entrap
subtle and cumulative harmfulness (especially of a disease)
Source: WordNetThe insidiousness of science lies in its claim to be not a subject, but a method. Katharine Fullerton Gerould
I'm just one asshole defending against legions of better-paid actors with an infinite capacity for insidiousness. Source: Internet
My unique protection has left me like one of the guys, largely clueless to the scope and daily insidiousness of sexual harassment and assault. Source: Internet