Translation of "insidious" - English-Polish dictionary

insidious

adjective uk us /ɪnˈsɪdiəs/

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

podstępny
the insidious effects of pollution
insidiously adverb

podstępnie
insidiousness noun [ U ]

podstępność

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