1. disturb in mind or make uneasy or cause to be worried or alarmed;
"She was rather perturbed by the news that her father was seriously ill"
2. disturb or interfere with the usual path of an electron or atom;
"The electrons were perturbed by the passing ion"
3. cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull;
"The orbits of these stars were perturbed by the passings of a comet"
4. throw into great confusion or disorder;
"Fundamental Islamicists threaten to perturb the social order in Algeria and Egypt"