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Adjective: nonstandard  'nón'stan-du(r)d
  1. (linguistics) 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
  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