insidious

Part of speech: adjective

Doing or contriving secret harm; treacherous.

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Usage examples "insidious":

  1. He tried in many insidious ways to stimulate the boys to think out and carry forward original work, and in almost every instance he succeeded in doing this in such a way that the boys themselves suggested the work to be done. - "The Wonder Island Boys: Exploring the Island", Roger Thompson Finlay.
  2. I never dreamed of jealousy, Alfred Bernard, or I might have seen beforehand the wiles of the insidious tempter. - "Hansford: A Tale of Bacon's Rebellion", St. George Tucker.
  3. Phil Abingdon had experienced in her own person the insidious power of Ormuz Khan. - "Fire-Tongue", Sax Rohmer.