Synonyms for Unaccomplished:

adj.

incomplete (adjective)
incomplete, patchy, deficient, sectional, fragmentary, discontinuous, unattained, insufficient, partial, short, embryonic, Curtailed, unsatisfactory, undone, unachieved, immature, lacking, scanty, segmental, unfulfilled, missing, unfinished, fractional.
undone (adjective)
unfinished.
unfinished (adjective)
incomplete, unfulfilled.

n.

unskilled (noun)
inexpert, uneducated, untrained, incompetent.

Other synonyms:

Other relevant words:
inexpert, uneducated, untrained, incompetent.