Translation of "insidious" - English-Russian dictionary

insidious

adjective uk us /ɪnˈsɪdiəs/

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

постепенно наносящий вред, коварный
the insidious effects of pollution
insidiously adverb

исподволь
insidiousness noun [ U ]

коварство (болезни и т. д.)

(Translation of “insidious” from the Cambridge English–Russian Dictionary © Cambridge University Press)