insidious
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Learner's definition of INSIDIOUS
[more insidious; most insidious]
formal
:
causing harm in a way that is gradual or not easily noticed
-
Most people with this insidious disease have no idea that they are infected.
-
an insidious enemy
— insidiously
adverb-
The disease progresses insidiously.
— insidiousness
noun [noncount] Comments & Questions
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