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

Similar word(s): cark, disorder, disquiet, distract, trouble, unhinge

Definition categories: emotion, disturb, trouble, upset

2. disturb or interfere with the usual path of an electron or atom

- The electrons were perturbed by the passing ion

Definition categories: motion, deviate

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

Definition categories: motion, deviate

4. throw into great confusion or disorder

- Fundamentalists threaten to perturb the social order

Similar word(s): derange

Definition categories: change, disarray, disorder