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Definitions

Century Dictionary and Cyclopedia

  1. n. The quality of being insidious; deceitfulness; treachery.

Wiktionary

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

GNU Webster's 1913

  1. n. A subtle and cumulative harmfulness, especially of a disease.
  2. n. the quality of being designed to entrap.

WordNet 3.0

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

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‘insidiousness’ has been looked up 663 times, added to 3 lists, and has a Scrabble score of 14.