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Definition of insidious:

  1. Intended to entrap; characterized by treachery and deceit; as, insidious arts.
  2. Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; - said of persons; as, the insidious foe.

Synonyms:

harmful, elusive, damaging, unsafe, pestilent, deadly, hazardous, subtle, injurious, perilous, risky, ruinous, dangerous, seductive, pernicious, baneful, disastrous.

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