What is the meaning of insidious?

adjective

  • Beguiling but harmful.
    • usage: "insidious pleasures"
  • Intended to entrap.
  • Working or spreading in a hidden and usually injurious way.
    • usage: "glaucoma is an insidious disease"; "a subtle poison"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). insidious. Retrieved September 20, 2026, from http://smartdefine.org/insidious/definitions/1176671
ChicagoWordNet. 2010. "insidious" http://smartdefine.org/insidious/definitions/1176671 (accessed September 20, 2026).
HarvardWordNet 2010, insidious, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/insidious/definitions/1176671>.
MLAWordNet. "insidious" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/insidious/definitions/1176671>
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