non-standard
🇺🇸
/ˌnɑːn ˈstændərd/
🇬🇧
/ˌnɒn ˈstændəd/
Not following the usual rules or accepted norms.
Some people speak a non-standard version of English.
Different from what is commonly used or expected.
The non-standard dimensions of the furniture made it difficult to fit in the room.