The Collaborative International Dictionary of English v.0.48:

Unperfected \Unperfected\
   See perfected.

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "unperfected":
   adulterated, blemished, damaged, defective, deficient, erroneous,
   fallible, faulty, found wanting, immature, impaired, imperfect,
   imprecise, impure, inaccurate, inadequate, incomplete, inexact,
   lacking, makeshift, mediocre, mixed, not perfect, off, partial,
   patchy, short, sketchy, undeveloped, uneven, unfinished, unsound,
   unthorough, wanting