Mental deterioration is the gradual decline of a person's mental faculties and abilities. Some synonyms for mental deterioration include cognitive decline, brain degeneration, mental decline, cognitive impairment, and dementia. Other expressions that suggest the same meaning are intellectual decay, memory loss, and loss of mental acuity. These terms are commonly associated with conditions such as Alzheimer's disease, Parkinson's disease, and Huntington's disease. They indicate a steady loss of cognitive, reasoning, and memory abilities over time. Seeking medical attention and proper treatment can help slow down or manage mental deterioration and its associated symptoms. Early identification and intervention can also help reduce the effects of mental deterioration.