Lewis & Short

cŏthurnātus, a, um, adj. [cothurnus], of or pertaining to the cothurnus, lit. buskined; hence, elevated, lofty, tragic (opp. excalceatus, comic, Sen. Ep. 8, 8; 76, 31; not ante-Aug.): Maronis grande opus, Mart. 5, 5, 8: Lycophron, Ov. lb. 529: vates, id. Am. 2, 18, 18: deae, id. F. 5, 348: sermo, Macr. S. 7, 5 fin.: scelera, Lact. 6, 20.
* adv.: cŏ-thurnātē, loftily, tragically; only comp. (late Lat.): cothurnatius, Amm. 28, 1, 4.