opīnor, ātus, 1, v. dep. etym. dub.; perh. akin to Gr. ὄσσεσθαι; root οπ-, to be of opinion, to suppose, imagine, conjecture, deem, believe, think, judge (freq. and class.; syn.: arbitror, reor, censeo, sentio, credo); constr. with acc., an obj.-clause, with de, or absol.: aliquid, Cic. Mur. 30, 62: quoad opinatus sum, me in provinciam exiturum, etc., id. Fam. 7, 17, 2: de vobis hic ordo opinatur non secus ac, etc., think, id. Pis. 20, 45: male de Caesare, to have a bad opinion of, to think ill of, Suet. Aug. 51: servus gravissime de se opinans, id. ib. 67: de rege durius, Just. 12, 5, 8.

—Parenthet.: opinor or ut opinor, as I think, as I believe, according to my opinion: Dem. Per mare ut vectu's, nunc oculi terram mirantur tui. Char. Magis opinor, Plaut. Merc. 2, 3, 35: Cepius, opinor, olim: non omnibus dormio, Cic. Fam. 7, 24, 1: sed, opinor, quiescamus, id. Att. 9, 6, 2: a primo, ut opinor, animantium ortu petitur origo summi boni, id. Fin. 2, 10, 31: opinor concedes, multo hoc esse gravius, id. Div. in Caecil. 16, 54; so Hor. S. 1, 3, 53; id. Ep. 1, 16, 78.!*? Act. collat. form opīno (anteclass.): ita sapere opino esse optimum, Enn. ap. Non. 475, 5 (Trag. v. 181 Vahl.); so Pac. Caecil. and Plaut. ib.

— opīnā-tus, a, um, in pass. signif. as P. a., supposed, imagined, fancied (class.): bona, mala, Cic. Tusc. 4, 6, 11; 3, 11, 24: interdicta est mathematicorum callida impostura, et opinatae artis persuasio, Mos. et Rom. Leg. Coll. 15, 2, 1.

—Post-class., celebrated, renowned, illustrious, famous: certamen, Amm. 21, 6, 3.

—Sup.: opinatissima insula, Flor. 2, 7, 8 dub.: civitas, Vulg. Judith, 2, 13.