† fiˈdelious,a.Obs. [f. L. fidēli-s + -ous.] Faithful. 1650S. Sheppard Candido 14, I..have found thee cordially fidelious.1655Marrow of Complements 114 Your fidelious servitour.1656S. Holland Zara (1719) 16 The Champion and his fidelious. Land-loper Soto.