perturb

(verb) disturb in mind or make uneasy or cause to be worried or alarmed. Synonyms: unhinge, disquiet, trouble, cark, distract, disorder. Example: "She was rather perturbed by the news that her father was seriously ill."

(verb) disturb or interfere with the usual path of an electron or atom. Example: "The electrons were perturbed by the passing ion."

(verb) cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull. Example: "The orbits of these stars were perturbed by the passings of a comet."

(verb) throw into great confusion or disorder. Synonyms: derange, throw out of kilter. Example: "Fundamental islamicists threaten to perturb the social order in algeria and egypt."