The Collaborative International Dictionary of English v.0.48:

Incompletely \In`com*plete"ly\, adv.
   In an incomplete manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incompletely
    adv 1: not to a full degree or extent; "words incompletely
           understood"; "a form filled out incompletely"

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "incompletely":
   after a fashion, appreciably, at any rate, at best, at least,
   at most, at the least, at the most, at the outside, at worst,
   by halves, comparatively, defectively, deficiently, detectably,
   fairly, faultily, imperfectly, in a manner, in a way,
   in half measures, in installments, in part, in some measure,
   inadequately, insufficiently, leastwise, merely, mildly,
   moderately, modestly, not comprehensively, not exhaustively, only,
   part, partially, partly, pro tanto, purely, relatively, simply,
   so far, somewhat, thus far, to a degree, to some degree, tolerably,
   unsubstantially, visibly