Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
răbĭōsus, a, um, adj. [rabies], raving, fierce, mad, rabid (rare but class.; syn.: furiosus, furibundus): canis, Hor. Ep. 2, 2, 75; Plin. 29, 5, 32, § 98: homo, Plaut. Capt. 3, 4, 15: fortitudo, * Cic. Tusc. 4, 22, 50: rabiosa barbaraque vox, Petr. 96, 5: stridor (anserum sacrorum), id. 136, 4.
* Adv.: răbĭōsē, ravingly, madly, fiercely, rabidly: nihil iracunde rabioseve fecerunt, Cic. Tusc. 4, 22, 49.