Fundamental Islamicists threaten to perturb the social order in Algeria and Egypt1
disturb in mind or make uneasy or cause to be worried or alarmed1
She was rather perturbed by the news that her father was seriously ill1
cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull1
The orbits of these stars were perturbed by the passings of a comet1
disturb or interfere with the usual path of an electron or atom1