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INSIDIOUS

Definition:

1. [adjective] beguiling but harmful; "insidious pleasures"
   
   
2. [adjective] intended to entrap
   
   
3. [adjective] working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison"
   Synonyms: pernicious, subtle
   
   

Synonyms:

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