'Deviant' definitions:

Definition of 'deviant'

(from WordNet)
adjective
Markedly different from an accepted norm; "aberrant behavior"; "deviant ideas" [syn: aberrant, deviant, deviate]
noun
A person whose behavior deviates from what is acceptable especially in sexual behavior [syn: pervert, deviant, deviate, degenerate]

Definition of 'Deviant'

From: GCIDE
  • Deviant \De"vi*ant\, a.
  • 1. Deviating. [Obs.] [1913 Webster]
  • 2. having behavior or characteristics differing from that which is normal or expected, especially in an undesirable or socially disapproved manner; as, deviant behavior.
  • Syn: deviate. [PJC]