English word incomprehensible comes from Latin incomprehensibilis (Incomprehensible.)

Detailed word origin of incomprehensible

Dictionary entry	Language	Definition
incomprehensibilis	Latin (lat)	Incomprehensible.
incomprehensible	Middle French (ca. 1400-1600) (frm)	Incomprehensible.
incomprehensible	English (eng)	Impossible or very difficult to understand.