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insidious definition

in·sidi·ous (in sid′ē əs)

adjective

  1. characterized by treachery or slyness; crafty; wily
  2. operating in a slow or not easily apparent manner; more dangerous than seems evident an insidious disease

Etymology: L insidiosus < insidiae, an ambush, plot < insidere, to sit in or on, lie in wait for < in-, in + sedere, to sit

Related Forms:

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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