WordWeb Online

1. Not conforming to the language usage of a prestige group within a community
   "a nonstandard dialect is one used by uneducated speakers or socially disfavoured groups"; "the common core of nonstandard words and phrases in folk speech"
    
2. Varying from or not adhering to a standard
   "nonstandard windows"; "envelopes of nonstandard sizes"; "nonstandard lengths of board"
    
3. Not standard; not accepted as a model of excellence
   "a nonstandard text"

See also: amount, bad, deficient, inferior, measure, nonnormative, quantity, substandard, unacceptable, unaccepted

Antonym: standard

Encyclopedia: Nonstandard