Su"per*a*bly

from The Collaborative International Dictionary of English v.0.48

Superable \Su"per*a*ble\, a. [L. superabilis, from superare to
   go over, to surmount, fr. super above, over.]
   Capable of being overcome or conquered; surmountable.
   [1913 Webster]

         Antipathies are generally superable by a single effort.
                                                  --Johnson.
   [1913 Webster] -- {Su"per*a*ble*ness}, n. -- {Su"per*a*bly},
   adv.
   [1913 Webster]