The term "manic-depressive insanity" was historically used to describe a mental illness characterized by extreme mood swings and changes in energy levels. However, this term is now considered outdated and stigmatizing. Instead, mental health professionals use the term "bipolar disorder" to describe this condition. Bipolar disorder is characterized by periods of mania and depression, and there are different types of the disorder depending on the severity and frequency of these episodes. Other less stigmatizing synonyms for manic-depressive insanity may include mood disorder, affective disorder, or bipolar illness. It is important to use respectful and accurate language when discussing mental health conditions to reduce stigma and promote understanding.