Lewis & Short

interrĭtē, adv., v. interritus fin.

in-terrĭtus, a, um, adj., undaunted, undismayed, unterrified (poet. and in postAug. prose; cf. impavidus): bracchia interritus extulit ad auras, Verg. A. 5, 427: spectatque interrita pugnas, id. ib. 11, 837: vultu, Quint. 1, 3, 4: classis interrita fertur, fearless, Verg. A. 5, 863; Ov. M. 13, 198; 15, 514; Tac. A. 1, 64; Quint. 5, 7, 11 al.; Curt. 6, 5, 29; 3, 6, 9 al.
With gen.: mens interrita leti, unterrified at death, not afraid of death, Ov. M. 10, 616.
Adv.: interrĭtē, undauntedly, Mart. Cap. 1, § 16 init.