insidious Meaning, definition in Cambridge English Dictionary
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Meaning of "insidious" - English Dictionary

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insidiousadjective

uk   us   /ɪnˈsɪd.i.əs/
(of something unpleasant or dangerous) gradually and secretly causing harm: High blood pressure is an insidious condition which has few symptoms.
insidiously
adverb uk   us   /-li/
The disease begins insidiously and progresses relentlessly.
insidiousness
noun [U] uk   us   /-nəs/
We must recognise the insidiousness of these racial stereotypes.
(Definition of insidious from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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