insidious Meaning in the Cambridge Learner’s Dictionary
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Meaning of “insidious” - Learner’s Dictionary

insidious

adjective
 
 
/ɪnˈsɪdiəs/
having harmful effects that happen gradually so you do not notice them for a long time: the insidious effects of pollutionIndistinct and invisibleSerious and unpleasantNot attractive to look atInformal words for bad
insidiously adverb insidiousness noun [U]
(Definition of insidious from the Cambridge Learner’s Dictionary © Cambridge University Press)
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