Insidiousness

noun

Definitions

Noun
  1. 1
    A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious. uncountable, usually

    "This lent a new insidiousness to his temptation, since her contempt would be a refuge from his own."

  2. 2
    the quality of being designed to entrap wordnet
  3. 3
    subtle and cumulative harmfulness (especially of a disease) wordnet

Etymology

From insidious + -ness.

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