Insidiously

The Century Dictionary and Cyclopedia
  • In an insidious manner; deceitfully; treacherously.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • adverb. in an insidious manner
  • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • adverb. in a harmfully insidious manner
  • Word Usage
    "-- Lecointre, our old Draper of Versailles, in these questionable circumstances, sees nothing he can do so safe as rise, 'insidiously' or not insidiously, and move, according to established wont, that the Robespierre Speech be 'printed and sent to the Departments.'"