in-fătīgābĭlis, e, adj., indefatigable (post-Aug.): cursus, Plin. 28, 19, 78, § 257: quiddam est virtus, Sen. Vit. Beat. 7: animus, id. Ep. 66 med.; Lact. 7, 27 fin.; Macr. S. 1, 21, 17.
Adv.: in-fătīgābĭlĭter, indefatigably: gaudere, Aug. Ep. 32 ad Paul.