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Definitions

Century Dictionary and Cyclopedia

  1. n. The character of being pernicious, very injurious, mischievous, or destructive; hurtfulness.

Wiktionary

  1. n. The condition of being pernicious; destructiveness

WordNet 3.0

  1. n. grave harmfulness or deadliness

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‘perniciousness’ has been looked up 742 times, added to 2 lists, and has a Scrabble score of 18.