I.false-speaking, lying, mendacious (ante- and post-class.): “nihil est stolidius, Neque mendaciloquius,” Plaut. Trin. 1, 2, 163.—As subst.: mendācĭlŏquus , i, m., a liar: “mendaciloquorum doctrinae,” Tert. adv. Psych. 2.
mendācĭlŏquus , a, um, adj. mendacium-loquor,