inexcogitabilis

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

ĭn-excōgĭtābĭlis, e, adj. [2. in-excogito],

inconceivable , incomprehensible (eccl. Lat.), Lact. Inst. 1, 8; Tert. adv. Val. 37.