unconceivably

from The Collaborative International Dictionary of English v.0.48
Unconceivable \Un`con*ceiv"a*ble\, a.
   Inconceivable. [Obs.] --Locke. -- {Un`con*ceiv"a*ble*ness},
   n. [Obs.] -- {Un`con*ceiv"a*bly}, adv. [Obs.]
   [1913 Webster]
    

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