insidious

Adjective
  1. Beguiling but harmful (synset 302105164)
    "insidious pleasures"
    similar to: seductive - tending to entice into a desired action or state
  2. Intended to entrap (synset 302067510)
    similar to: dangerous, unsafe - involving or causing danger or risk; liable to hurt or harm
  3. Working or spreading in a hidden and usually injurious way (synset 301165950)
    "glaucoma is an insidious disease"; "a subtle poison"
    similar to: harmful - causing or capable of causing harm
    same as: pernicious, subtle

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