English

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Etymology

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From insidious +‎ -ness.

Noun

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insidiousness (usually uncountable, plural insidiousnesses)

  1. A surreptitious harmfulness, quality of entrapment, or treacherousness; the characteristic of being insidious.
    • 1900, Edith Wharton, chapter 8, in The Touchstone:
      This lent a new insidiousness to his temptation, since her contempt would be a refuge from his own.

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References

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