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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.

Etymology

Origin of nongrammatical

First recorded in 1950–55; non- + grammatical

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.