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Adjective: insidious  in'si-dee-us
  1. Beguiling but harmful
    "insidious pleasures"
     
  2. Intended to entrap
     
  3. Working or spreading in a hidden and usually injurious way
    "glaucoma is an insidious disease"
    - pernicious, subtle

See also: dangerous, harmful, insidiously, insidiousness, seductive, unsafe

Nearest

inside job
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