Source : Webster's Revised Unabridged Dictionary (1913)

Pardonably \Par"don*a*bly\, adv.
   In a manner admitting of pardon; excusably. --Dryden.

Source : WordNet®

pardonably
     adv : in an excusable manner or to an excusable degree; "he was
           excusably late" [syn: {excusably}, {forgivably}] [ant:
           {inexcusably}, {inexcusably}, {inexcusably}]