nonstandard

Adjective

• not standard; not accepted as a model of excellence
  • a nonstandard text
    

• varying from or not adhering to a standard
  • nonstandard windows
    
  • envelopes of nonstandard sizes
    
  • nonstandard lengths of board
    

• not conforming to the language usage of a prestige group within a community
  • a nonstandard dialect is one used by uneducated speakers or socially disfavored groups
    
  • the common core of nonstandard words and phrases in folk speech- A.R.Dunlap
    

Related words

• Antonyms: 
  standard , received