Inappropriate speech is a common symptom of Alzheimer's dementia.

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81. Palilalia...

pali·la·lia
ˌpaləˈlālēə/
noun: palilalia

A speech disorder characterized by involuntary repetition of words, phrases, or sentences.

Palilalia may occur in conditions affecting the pre-frontal cortex or basal ganglia regions, either from physical trauma, neurodegenerative disorders, genetic disorders, or a loss of dopamine in these brain regions.[4] Palilalia occurs most commonly in Tourette syndrome and may be present in neurodegenerative disorders like Alzheimer's disease and progressive supranuclear palsy.[4][5]

Palilalia is defined as the repetition of the speaker's words or phrases, often for a varying number of repeats. Repeated units are generally whole sections of words and are larger than a syllable, with words being repeated the most often, followed by phrases, and then syllables or sounds.[2] [3] Palilalic repetitions are often spoken with decreasing volume and speed up over time.[6]

https://en.wikipedia.org/wiki/Palilalia

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