GNU Collaborative International Dictionary of English

Found one definition

1.       
   Deviant (?), 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]