Webster's Revised Unabridged Dictionary · 1913

Incomprehensible

Incomprehensible , adjective

[Latin incomprehensibilis: compare French incompréhensible. See In- not, and Comprehensible.]

1.
Not capable of being contained within limits.
An infinite and incomprehensible substance. — Hooker
2.
Not capable of being comprehended or understood; beyond the reach of the human intellect; inconceivable.
And all her numbered stars that seem to roll Spaces incomprehensible. — Milton