Nonstandard things are different from the usual version or type of that thing.
The shop is completely out of nonstandard sizes.
nonstandard in British English
(ˌnɒnˈstændəd)
adjective
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
nonstandard in American English
(ˌnɑnˈstændərd)
adjective
not standard; specif., designating or of usages, locutions, grammatical constructions, pronunciations, etc., that do not fall into the category of standard speech
see also substandard
Examples of 'nonstandard' in a sentence
nonstandard
All we know is that she uses nonstandard forms in conversation.