ingrātĭfĭcus, a, um, adj. [ingratusfacio],
unthankful , ungrateful : Argivi, Att. ap. Cic. Sest. 57, 122 (Trag. Rel. v. 364 Rib.).
ingrātificus adj. ingratus + 2 FAC-, unthankful, ungrateful : Argivi. ...
An Elementary Latin Dictionary