veriloquus

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

vērĭlŏquus, a, um, adj. [verus-loquor],

speaking truly , truth-telling (very rare): oraculum, Front. Ep. ad M. Caes. 3, 12 Mai: lingua, Hier. adv. Ruf. 3, 42.