from
The Collaborative International Dictionary of English v.0.48
Inconceivable \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.
[1913 Webster]
It is inconceivable to me that a spiritual substance
should represent an extended figure. --Locke.
-- {In`con*ceiv"a*ble*ness}, n. -- {In`con*ceiv"a*bly}, adv.
[1913 Webster]
The inconceivableness of a quality existing without any
subject to possess it. --A. Tucker.
[1913 Webster]