WordNet (r) 3.0 (2006):

imperfectly
    adv 1: in an imperfect or faulty way; "The lobe was imperfectly
           developed"; "Miss Bennet would not play at all amiss if
           she practiced more"- Jane Austen [syn: imperfectly,
           amiss] [ant: perfectly]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "imperfectly":
   a bit, a little, barely, by a hair, by an ace, defectively,
   deficiently, ever so little, exiguously, faintly, faultily, feebly,
   hardly, inadequately, inappreciably, incompletely,
   inconsequentially, insignificantly, just a bit, lightly, little,
   meagerly, minimally, minutely, negligibly, not hardly, only just,
   partially, scantily, scarcely, slightly, tant soit peu, triflingly,
   weakly