IPA: //nɒnˈstændəd//
KK: /nɑnˈstændərd/
Describing something that does not follow the usual rules or norms, often used in language or measurements.
The teacher explained that using nonstandard grammar can make it harder for others to understand you.
Nonstandard → It is formed from "non-" (meaning not) and "standard" (from Old French *estandard*, meaning a level of quality or measure). The word "nonstandard" means not conforming to a recognized standard or norm.
Think of 'not' ('non-') meeting a 'level of quality' ('standard') — that's why nonstandard refers to something that doesn't meet the usual criteria.