Word:

Insidious

In`sid´i`ous
a.1.
1.Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; - said of persons; as, the insidious foe.
2.Intended to entrap; characterized by treachery and deceit; as, insidious arts.
The insidious whisper of the bad angel.
- Hawthorne.
3.Acting or proceeding unobserved or in a seemingly harmless manner, but slowly or eventually doing great damage; as, an insidious disease; an insidious plot.
Insidious disease
(Med.) a disease existing, without marked symptoms, but ready to become active upon some slight occasion; a disease not appearing to be as bad as it really is.
Adj.1.insidious - beguiling but harmful; "insidious pleasures"
2.insidious - intended to entrap
3.insidious - working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison"
Synonyms: pernicious, subtle
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Inside callipers
inside clinch
Inside finish
inside information
inside job
Inside lap
inside loop
inside out
inside track
inside-out
insider
insider information
insider trading
Insidiate
Insidiator
Insidiatores viarum
-- Insidious --
Insidious disease
insidiously
insidiousness
Insight
insightful
insightfulness
Insignia
insignia of rank
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Insignificance
Insignificancy
Insignificant
Insignificantly
Insignificative
Insignment
Insimul computassent
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