nonstandard

1 ENTRIES FOUND:
nonstandard /ˌnɑːnˈstændɚd/ adjective
nonstandard
/ˌnɑːnˈstændɚd/
adjective
Britannica Dictionary definition of NONSTANDARD
1 
: not accepted or used by most of the educated speakers and writers of a language
2 
: not the usual size or kind
— opposite standard; compare substandard