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