inconceivable

Webster's Dictionary (1913)

Origin: Pref. in- not + conceivable: cf. F. inconcevable.

Not conceivable; incapable of being conceived by the mind; not explicable by the human intellect, or by any known principles or agencies; incomprehensible; as, it is inconceivable to us how the will acts in producing muscular motion.

It is inconceivable to me that a spiritual substance should represent an extended figure.— John Locke

— In′wb-a2′>′con·ceiv′wb-a1′>′a·ble·ness, noun — In′wb-a2′>′con·ceiv′wb-a1′>′a·bly, adverb

The inconceivableness of a quality existing without any subject to possess it.— Abraham Tucker

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54