non-standard

Từ điển Oxford Advanced Learner 8th

ˌnon-ˈstandard [non-standard] BrE NAmE adjective
1. (of language)not considered correct by most educated people
•non-standard dialects
•non-standard English
compare ↑standard
2. not the usual size, type, etc
•The paper was of non-standard size.

Example Bank:
•Older students with non-standard entry qualifications are accepted on many courses.
•Standard English and non-standard dialects have much in common.
•The documents are stored in files that are of non-standard size.