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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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