not standard.
not conforming in pronunciation, grammar, vocabulary, etc., to the usage characteristic of and considered acceptable by most educated native speakers; lacking in social prestige or regionally or socially limited in use: a nonstandard dialect; nonstandard English. Compare standard ( def 27 ).
Mathematics. of or pertaining to a generalized system of numbers that includes the real numbers but also includes infinite and infinitesimal numbers: nonstandard analysis.

1920–25; non- + standard

A term labeled Nonstandard in this dictionary is one that is thought to be characteristic of the speech of persons with little education—a term that is often regarded as a marker of low social status. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nonstandard (nɒnˈstændəd)
1.  denoting or characterized by idiom, vocabulary, etc, that is not regarded as correct and acceptable by educated native speakers of a language; not standard
2.  deviating from a given standard

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Other nonstandard features include a daily wine social, a free shoe-shine and
  an eco-friendly policy.
Nonstandard guest rooms also have work desks and in-room hot tubs.
There is no reason to believe that any nonstandard vernacular is in itself an
  obstacle to learning.
Nonstandard models, which are useful in math, demonstrate that various
  conditions can be satisfied in more than one way.
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