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nongrammatical

[non-gruh-mat-i-kuh l]
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adjective
  1. (of a sentence or expression) not conforming to the grammatical rules of a given language.

Origin of nongrammatical

First recorded in 1950–55; non- + grammatical
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018