High Quality Content by WIKIPEDIA articles! Agrammatism is a form of expressive aphasia that refers to the inability to speak in a grammatically correct fashion. People with agrammatism may have telegraphic speech, a unique speech pattern with simplified formation of sentences (in which many or all function words are omitted), akin to that found in telegraph messages. Deficits in agrammaticism are often language-specific, however—in other words, "agrammaticism" in speakers of one language may present differently than in speakers of another.