Definitions of insidious:
  • adjective:   intended to entrap
  • adjective:   beguiling but harmful
    Example: "Insidious pleasures"
  • adjective:   working or spreading in a hidden and usually injurious way
    Example: "Glaucoma is an insidious disease"

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Book See insidious used in context: 5 rhymes, several books and articles.

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