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insidious-
 
Adjective insidious- has 3 senses
  1. insidious - beguiling but harmful; "insidious pleasures"
    Antonym: unseductive (indirect, via seductive)
  2. insidious - intended to entrap
    Antonym: safe (indirect, via dangerous)
  3. insidious, pernicious, subtle - working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison"
    Antonym: harmless (indirect, via harmful)
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