1. not conforming to the rules of grammar; violating standard grammatical structure
Usage: commonly used in linguistics and language education

Examples

• The sentence 'He go to school' is agrammatical because it lacks proper subject-verb agreement.
• Linguists often mark agrammatical constructions with an asterisk in their analyses.
• Even native speakers occasionally produce agrammatical utterances in casual speech.
• The student's essay contained several agrammatical phrases that needed correction.
• In formal writing, agrammatical sentences should be revised for clarity and correctness.
• The linguist explained why the word order in that sentence was agrammatical.