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What is another word for nonstandard?

What's another word for nonstandard? | Here's a list of synonyms for nonstandard.

Definition 1: not standard; not accepted as a model of excellence - [adjective denoting all]

Definition 1: varying from or not adhering to a standard - [adjective denoting all]

Definition 1: not conforming to the language usage of a prestige group within a community - [adjective denoting all]