The Collaborative International Dictionary of English v.0.48:

Unfinished \Un*fin"ished\, a.
   Not finished, not brought to an end; imperfect; incomplete;
   left in the rough; wanting the last hand or touch; as, an
   unfinished house; an unfinished picture; an unfinished iron
   casting.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unfinished
    adj 1: not brought to the desired final state [ant: finished]
    2: not brought to an end or conclusion; "unfinished business";
       "the building is still unfinished" [ant: finished]
    3: lacking a surface finish such as paint; "bare wood";
       "unfinished furniture" [syn: bare, unfinished]

Moby Thesaurus II by Grady Ward, 1.0:

102 Moby Thesaurus words for "unfinished":
   adulterated, amateurish, arrested, backward, blemished, coarse,
   crude, dabbling, damaged, defective, deficient, dilettante,
   dilettantish, embryonic, erroneous, fallible, faulty,
   found wanting, immature, impaired, imperfect, imprecise, impure,
   in embryo, in ovo, in the rough, inaccurate, inadequate,
   incomplete, inexact, jackleg, lacking, makeshift, mediocre, mixed,
   neglected, not perfect, off, oversimple, partial, patchy,
   reductionistic, reductive, rough, roughcast, roughhewn, rude,
   rudimental, rudimentary, semiskilled, short, simplistic, sketchy,
   stunted, unaccomplished, unachieved, unattained, unblown,
   unbusinesslike, uncoached, uncompleted, unconsummated,
   uncultivated, uncultured, uncut, underdeveloped, undeveloped,
   undischarged, undone, undressed, unendowed, uneven, unexecuted,
   unfashioned, unformed, unfulfilled, ungifted, unhewn, uninitiated,
   unlabored, unlicked, unperfected, unperformed, unpolished,
   unprepared, unprimed, unprocessed, unprofessional, unrealized,
   unrefined, unschooled, unskilled, unsound, untalented, untaught,
   unthorough, untrained, untreated, untutored, unworked, unwrought,
   wanting