Lewis & Short

crēdŭlus, a, um, adj. [credo, II. C. 2.], that easily believes a thing, credulous, easy of belief, confiding.

  1. I. Prop. (freq. and class.).
          1. (α) Absol.: in fabulis stultissima persona est improvidorum et credulorum senum, Cic. Lael. 26, 100: stultus auditor et credulus, id. Font. 6, 13; Quint. 11, 1, 71; Tac. H. 1, 12 fin.; Hor. C. 1, 5, 9; Ov. M. 3, 432 et saep.
            Of fishes trusting to the hook, Ov. M. 8, 858; cf. credulitas; and of animals anticipating no danger, Hor. Epod. 16, 33.
          2. (β) With dat.: non ego credulus illis, Verg. E. 9, 34; Prop. 1, 3, 28; Hor. C. 1, 11, 8; Sil. 10, 478; Tac. H. 2, 23.
          3. * (γ) With in aliquid: nos in vitium credula turba sumus, Ov F. 4, 312.
  2. II. Transf., of inanimate subjects: aures regis, Curt. 10, 1, 28: credula res amor est, Ov. H. 6, 21; id. M. 7, 826: spes animi mutui, Hor. C. 4, 1, 30: convivia, full of confidence, confiding, trusting, Just. 2, 10, 10: fama ( = facile credens), Tac. H. 1, 34 fin.; cf. Roth ad Tac. Agr. p. 210.