grammatically incorrect or awkward; not conforming to the rules or principles of grammar or accepted usage: an ungrammatical sentence.
- un·gram·mat·i·cal·ly, adverb
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How to use ungrammatical in a sentence
The videos’ narration is delivered in a robotic voice speaking fractured and sometimes-ungrammatical English.Pro-China propaganda campaign exploits U.S. divisions in videos emphasizing Capitol attack | Craig Timberg, Eva Dou | February 4, 2021 | Washington Post
The language they use is not only ungrammatical but oftentimes both slangy and profane.The Mother and Her Child | William S. Sadler
No ungrammatical expression can come in that will not be rejected by the best thinkers and speakers.Mary and I | Stephen Return Riggs
Dodo's German was far more expressive than his, it was also ludicrously ungrammatical, and intensely rapid.Dodo's Daughter | E. F. Benson
Blots like the ungrammatical fourth line are not infrequent with him.Keats | Sidney Colvin
Page 278, ungrammatical construction "The men takes" retained.
British Dictionary definitions for ungrammatical
(of a sentence) not regarded as correct by native speakers of the language
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012