In`con*ceiv"a*ble (?), a. [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.

-- In`con*ceiv"a*ble*ness, n. -- In`con*ceiv"a*bly, adv.

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

• unable to be conceived, unbelievable