Wordnet 3.0
ADVERB (1)
1.
to an inconceivable degree;
- Example: "inconceivably small"
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]
WordNet (r) 3.0 (2006):
inconceivably
adv 1: to an inconceivable degree; "inconceivably small"