NONSTANDARD
nonstandard
(adjective) not standard; not accepted as a model of excellence; “a nonstandard text”
nonstandard
(adjective) varying from or not adhering to a standard; “nonstandard windows”; “envelopes of nonstandard sizes”; “nonstandard lengths of board”
nonstandard
(adjective) 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
Source: WordNet® 3.1
Etymology
Adjective
nonstandard (comparative more nonstandard, superlative most nonstandard)
Not standard.
Synonym: unstandard
Antonym: standard
(linguistics) Not conforming to the standard variety, or to the language as used by the majority of its speakers.
Synonym: substandard
Noun
nonstandard (plural nonstandards)
Something that is not standard.
Source: Wiktionary