Bedeutung von “insidious” — Learner’s Dictionary

insidious

adjective us uk /ɪnˈsɪdiəs/

having harmful effects that happen gradually so you do not notice them for a long time:

the insidious effects of pollution
insidiously adverb
insidiousness noun [ U ]

(Definition von “insidious” aus dem Cambridge Learner's Dictionary © Cambridge University Press)