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Meaning & Definition of Insidious in English

English

Insidious

/ɪnsɪdiəs/

adjective

1. Beguiling but harmful

  • "Insidious pleasures"
synonym:
  • insidious

2. Intended to entrap

synonym:
  • insidious

3. Working or spreading in a hidden and usually injurious way

  • "Glaucoma is an insidious disease"
  • "A subtle poison"
synonym:
  • insidious,
  • pernicious,
  • subtle