nongrammatical

American  

[non-gruh-mat-i-kuhl] / ˌnɒn grəˈmæt ɪ kəl /

adjective

1. (of a sentence or expression) not conforming to the grammatical rules of a given language.

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Etymology

Origin of nongrammatical

First recorded in 1950–55; non- + grammatical

Example Sentences

Back in 2013, Bitcoin mania was reaching its first feverish peak, and everyone was sharing doge memes—a picture of a surprised/frightened/skeptical-looking shiba inu with some nongrammatical exclamations in comic sans, like “wow,” “much scared,” and “very snack.”

From Slate

A printer’s misreading, Mr. Bruster argues, may also explain a particularly clumsy and nongrammatical stretch in the Additional Passages.

From New York Times