Mercurial Psychosis, also known as mercurial madness, refers to a mental disorder characterized by sudden and unpredictable changes in mood, behavior, and thinking. Synonyms for this condition can convey the essence of its symptoms. Terms such as "volatile dementia", "erratic psychosis" or "unpredictable neurosis" underline the unpredictable nature of the disorder. The phrase "fickleness frenzy" emphasizes the rapid and inconsistent shifts in mood and cognitive processing experienced by individuals. "Fluctuating derangement" and "capricious insanity" capture the unstable and ever-changing nature of the condition. Employing these synonyms illuminates the complex and bewildering nature of Mercurial Psychosis, highlighting its erratic and shifting manifestations.