Lewis Short
(adjective) : intrĕpĭdans, antis, 2. in-trepido
* Not shaking, firm, strong, powerful (post-class.), Inscr. ap. Paulovich. Marm. Macarens. p. 61.— Adv.: intrĕpĭdan-ter, without trembling, intrepidly: ascendere,Non. 530, 5.
Charlton T. Lewis, Charles Short, A Latin Dictionary