The definition of a mental disorder is a problem in the mind that affects the personality, emotions and thought process.
(Psychiatry) Any of various mental disorders in which there is a symptom or group of symptoms that causes psychological pain or discomfort and may be very disabling: common neuroses include anxiety, compulsions, phobias, and depression
Extreme foolishness or irrationality:
Find another word for megalomania. In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for megalomania, like: lust for power, compulsion, egotism, misanthropy, instability, childishness, mental-disorder, neurosis, insanity, obsession and self-delusion.