Source : Webster's Revised Unabridged Dictionary (1913)

Acceptably \Ac*cept"a*bly\, adv.
   In an acceptable manner; in a manner to please or give
   satisfaction.

Source : WordNet®

acceptably
     adv : in an acceptable (but not outstanding) manner; "she plays
           tennis tolerably" [syn: {tolerably}, {so-so}] [ant: {unacceptably},
            {unacceptably}]