(of something unpleasant or dangerous ) gradually and secretly causing harm
发音
例句
1. That insidious man bad-mouthed me to almost everyone else. 那个阴险的家伙几乎见人便说我的坏话。 2. Organized crime has an insidious influence on all who come into contact with it. 所有和集团犯罪有关的人都会不知不觉地受坏影响。