What is the meaning of insidiously?

adverb

  • In a harmfully insidious manner.
    • usage: "these drugs act insidiously"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). insidiously. Retrieved September 20, 2026, from http://smartdefine.org/insidiously/definitions/1252167
ChicagoWordNet. 2010. "insidiously" http://smartdefine.org/insidiously/definitions/1252167 (accessed September 20, 2026).
HarvardWordNet 2010, insidiously, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/insidiously/definitions/1252167>.
MLAWordNet. "insidiously" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/insidiously/definitions/1252167>