insidious

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insidious /ɪnˈsɪdijəs/ adjective
insidious
/ɪnˈsɪdijəs/
adjective
Learner's definition of INSIDIOUS
[more insidious; most insidious] formal
: causing harm in a way that is gradual or not easily noticed

— insidiously

adverb

— insidiousness

noun [noncount]
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