WordWeb Online

1. Markedly different from an accepted norm
   "deviant ideas";
   - aberrant, deviate

1. A person whose behaviour deviates from what is acceptable especially in sexual behaviour
   - pervert, deviate, degenerate, perve [informal], perv [informal]
    
2. A thing, phenomenon, or trend that deviates from an expectation or pattern

Derived forms: deviants

See also: abnormal, unnatural

Type of: miscreant, reprobate

Encyclopedia: Deviant