mendaciloquus

mendācĭlŏquus, a, um, adj. [mendacium-loquor], 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.