incredundus

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

incrēdundus (incrēdendus), a, um, adj. [2. in-credo],

not to be believed , incredible (Appuleian): fabula, Ap. Met. 2, 12, 16; potentiae caerimoniarum, id. Flor. 2, p. 351: illecebrae frugum, id. Mag. p. 304, 25.