Definition of fanatical

"Fanatical" derives from the Latin word "fanaticus," meaning "belonging to a temple or shrine." This referred to individuals inspired by religious fervor. In ancient Rome, "fanaticus" was often associated with people exhibiting uncontrolled religious enthusiasm, sometimes considered "mad" or "possessed." Over time, the word shifted to describe intense, often obsessive enthusiasm for a particular cause or belief, losing its strictly religious connotations. This shift reflects how fanatical devotion, regardless of its object, can manifest in similar behaviors and emotions.