noun. a type of aphasia marked by conversation which doesn't really abide by grammatical regulations, such as rules overseeing word usage, verb tense, and subject and verb agreement. Commonly see [..]

Agrammatism is a main symptom of

The presence of grammatical errors in speech, such as the omission or incorrect usage of articles (“cow jumped over moon”), prepositions (“dog walk bridge”) or verbs (“cat eated mouse”).

A form of aphasia characterised by an inability to construct a grammatical sentence, and the use of unintelligible or incorrect words; caused by a lesion in the dominant temporal lobe. Synonyms: agrammatica, agrammatologia, jargon aphasia. (05 Mar 2000)

The inability to form sentences by virtue of a brain disorder.