1. 
[syn: reasonably, moderately, pretty, jolly, somewhat, fairly, middling, passably]
The Collaborative International Dictionary of English v.0.48:
Passably \Pass"a*bly\, adv.
   Tolerably; moderately.
   [1913 Webster] Passacaglia
WordNet (r) 3.0 (2006):
passably
    adv 1: to a moderately sufficient extent or degree; "pretty
           big"; "pretty bad"; "jolly decent of him"; "the shoes are
           priced reasonably"; "he is fairly clever with computers"
           [syn: reasonably, moderately, pretty, jolly,
           somewhat, fairly, middling, passably] [ant:
           immoderately, unreasonably]