The Collaborative International Dictionary
deficient inferior substandard
nonstandard \nonstandard\, non-standard \non-standard\adj.
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varying from or not adhering to a standard; as, nonstandard windows; envelopes of nonstandard sizes; non-standard lengths of board cost more per foot. Opposite of standard. [Narrower terms: deficient, inferior, substandard]
Syn: nonstandard.
(Linguistics) Not conforming to the language usage of a prestige group within a community; as, a nonstandard dialect is one used by uneducated speakers or socially disfavored groups. Opposite of standard.