Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

fallax, ācis (gen. plur. fallacium, Cic. Lael. 25, 91 al.; but fallacum, Cat. 30, 4), adj. [fallo], deceitful, deceptive, fallacious (class.; esp. freq. in Cic.; syn.: captiosus, fraudulentus, subdolus, dolosus, vafer, astutus, callidus): age, barbari (astrologi) vani atque fallaces: num etiam Graiorum historia mentita est? Cic. Div. 1, 19, 37: levium hominum atque fallacium, id. Lael. 25, 91; for which: facta impia fallacum hominum, Cat. 30, 4: vicinitas non assueta mendaciis, non fucosa, non fallax, non erudita artificio simulationis, Cic. Planc. 9, 22: posita fallacis imagine tauri, Ov. M. 3, 1 et saep.
Of inanim. and abstr. things: ut tamquam in herbis non fallacibus fructus appareat, Cic. Lael. 19, 68: (with fucosae) merces, id. Rab. Post. 14, 40: arva, Ov. A. A. 1, 401: siliquae, Verg. G. 1, 195: austri, id. A. 5, 850: herba veneni, id. E. 4, 24: vada, Plin. 5, 31, 34, § 128: genus tutius sed magis fallax (sc. venandi), more uncertain, id. 8, 8, 8, § 26 et saep.: spe falsa atque fallaci, Cic. Phil. 12, 2 fin.; so, spes, id. Mil. 34, 94: et captiosae interrogationes, id. Ac. 2, 15, 46: imitatio simulatioque virtutis, id. ib. 2, 46, 140: malitia est versuta et fallax nocendi ratio, id. N. D. 3, 30, 75.
Prov.: fallaces sunt rerum species, Sen. Ben. 4, 34, 1.
Comp.: fallacior undis, Ov. M. 13, 799: quid enim fallacius illis (vocibus)? id. R. Am. 687.
Sup.: oculorum fallacissimo sensu judicare, Cic. Div. 2, 43, 91.

        1. (β) With gen.: homines amicitiae fallaces, Tac. A. 16, 32.
        2. (γ) With dat.: Planasia navigiis fallax, Plin. 3, 6, 12, § 80.
          Hence, adv.: fallācĭter, deceitfully, fallaciously (cf.: falso, perperam): ratio hoc postulat, ne quid insidiose, ne quid simulate, ne quid fallaciter, Cic. Off. 3, 17, 68; id. Div. 1, 18, 35; id. Part. Or. 25, 90.
          Sup.: fallacissime, Plin. 12, 16, 35, § 71.