non-standard

Adjective

nonstandard (comparative more nonstandard, superlative most nonstandard)

1. Not standard.

   Synonyms:

   unstandard

   Antonyms:

   standard

2. Not conforming to the standard variety, or to the language as used by the majority of its speakers.
   • The resulting sequence of covert wh-pronoun + Complementiser has an overt counterpart in nonstandard varieties of English, as the following example (recorded from a BBC radio programme) illustrates:
     (91) England put themselves in a position [whereby that they took a lot of credit for tonightʼs...1988, Andrew Radford, chapter 9, in Transformational grammar: a first course, Cambridge, UK: Cambridge University Press, page 486

   Synonyms:

   substandard

3. Using numbers or methods beyond those used in traditional analysis, often introducing new concepts like infinitesimals or hyperreal numbers in order to solve difficult problems.
   • A concise and simple exposition of nonstandard methods applied to delta functions and to other generalized functions.1990, R. F. Hoskins, Standard and Nonstandard Analysis, Fundamental Theory, Techniques, and Applications, page 230

See all 4 meanings of nonstandard