Filled with or characterized by enthusiasm, or the conceit of special intercourse with God, or of direct revelations or instructions from him.Prone to enthusiasm; zealous or devoted; passionate in devotion to a belief or a principle, or the pursuit of an object: as, an enthusiastic reformer.Elevated; ardent; inspired by or glowing with enthusiasm: as, the speaker addressed the audience in enthusiastic strains.Synonyms Enthusiastic, Fanatical; eager, zealous, devoted, fervent, passionate, glowing; heated, inflamed, visionary. Enthusiastic is most frequently used with regard to a person whose sympathies or feelings are warmly engaged in favor of any cause or pursuit, and who is full of hope and ardent zeal; while fanatical is generally said of a person who has fantastic and extravagant views on religious or moral subjects, or some similarly absorbing topic. See superstition.n. An enthusiast.