sure Copy link Outline I. Objectively, certain, not to be doubted1. certus2. compertus (proved, satisfactorily made out)3. explōrātusII. To be trusted1. certus2. fīdusIII. Subjectively, entertaining no doubt • sure: I. Objectively, certain, not to be doubted: 1. certus: v. certain. 2. compertus (proved, satisfactorily made out): facts s. and certain, comperta et explorata, Liv. 42, 13, init. (opp. incertis jactata rumoribus): Cic. 3. explōrātus: v. certain. II. To be trusted: 1. certus: a s. friend, c. amicus, Enn. in Cic.: s. men, Cic. Fam. 1, 7. 2. fīdus: v. faithful, trusty. III. Subjectively, entertaining no doubt: usu. best expr. by phr.: I am quite s., compertum habeo, Sall. Cat. 58, init.: and with a certain diff. of meaning, mihi persuadeo, Cic. R. A. 2, extr.: also, mihi persuadetur, Caes. B. G. 1, 40: and persuasum habeo, ib. 3, 2, extr. [N.B.--Compertum habeo denotes the certainty resulting from external proof: the other phrr. only subjective conviction.] Parenthetically, I am s., may be expr. by hercle, mehercle, etc.: v. surely.