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Adverb: insidiously  in'sideeuslee
  1. In a harmfully insidious manner
    "these drugs act insidiously"
    - perniciously

See also: insidious

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