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Adverb: insidiously  in'si-dee-us-lee
  1. In a harmfully insidious manner
    "these drugs act insidiously";
    - perniciously

Encyclopedia: Insidiously

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inside loop
inside out
Inside Passage
inside track
inside-out
insider
insider information
insider trading
insides
insidious
insidiously
insidiousness
insight
insightful
insightfulness
insignia
insignia of rank
insignificance
insignificant
insignificantly
insincere