The Collaborative International Dictionary of English v.0.48:
Acceptably \Ac*cept"a*bly\, adv. In an acceptable manner; in a manner to please or give satisfaction. [1913 Webster]WordNet (r) 3.0 (2006):
acceptably adv 1: in an acceptable (but not outstanding) manner; "she plays tennis tolerably" [syn: acceptably, tolerably, so- so] [ant: intolerably, unacceptably]