WordWeb Online

1. Causing distress, worry or anxiety
   "perturbing news"; "a revelation that was most perturbing";
   - distressing, distressful, disturbing, troubling, worrisome, worrying, concerning

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";
   - unhinge, disquiet, trouble, cark, distract, disorder
    
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
   "Fundamentalists threaten to perturb the social order";
   - derange, throw out of kilter

See also: heavy

Type of: deviate, disarray, disorder, disturb, trouble, upset

Encyclopedia: Perturb