WordWeb Online

1. Thrown into a state of agitated confusion; ('rattled' is an informal term)
   "The more he loses, the more perturbed he gets";
   - flustered, hot and bothered, rattled

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
   "Fundamental Islamicists threaten to perturb the social order in Algeria and Egypt";
   - derange, throw out of kilter

See also: discomposed

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

Encyclopedia: Perturb