Lewis & Short

impăvĭdus (inp-), a, um, adj. [2. inpavidus], fearless, undaunted, intrepid (not freq. till after the Aug. per.; not in Cic. or Cæs.): ludere pendentes pueros et lambere matrem Impavidos, Verg. A. 8, 633: si fractus illabatur orbis, Impavidum ferient ruinae, Hor. C. 3, 3, 7: Teucer et Sthenelus, id. ib. 1, 15, 23: Gradivus, Ov. M. 14, 820: infantes, Plin. 28, 19, 78, § 258; 2, 81, 83, § 196: leo, Verg. A. 12, 8: lepus, Ov. M. 15, 100: pectora, Liv. 21, 30, 2: equi, id. 37, 20, 11: gens ingenio, id. 42, 59, 2; Curt. 9, 6, 24: soni, Ov. F. 2, 840.
Adv.: impăvĭdē, fearlessly, intrepidly: exhausto poculo, Liv. 39, 50, 8; 30, 15, 8.