fanaticism Copy link Outline 1. sŭperstĭtio, ōnis, f.2. perh. error fanaticus atque superstitiosus, furor religiosus, superstitiosus. • fanaticism: 1. sŭperstĭtio, ōnis, f.: this is perhaps the nearest word used by classical authors, but requires qualification: a pestilential f., exitiabilis s., Tac. Ann. 15, 44 (said by him of Christianity): a perverse f., prava et immodica s., Plin. Ep. 10, 97 (also of Christianity): in the same ep., Pliny speaks of the enthusiasm of the Christians as, pervicacia et inflexibilis obstinatio. 2. perh. error fanaticus atque superstitiosus, furor religiosus, superstitiosus.