The Collaborative International Dictionary of English v.0.48:

Unemployable \Unemployable\
   See employable.

WordNet (r) 3.0 (2006):

unemployable
    adj 1: not acceptable for employment as a worker; "his
           illiteracy made him unemployable" [ant: employable]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "unemployable":
   at leisure, at liberty, at loose ends, available, disengaged,
   fallow, free, functionless, idle, in disrepair, inapplicable,
   inoperable, inoperative, jobless, leisure, leisured, lumpen,
   nonfunctional, nonutilitarian, off, off duty, off work, otiose,
   out of employ, out of harness, out of order, out of whack,
   out of work, unconducive, unemployed, unfit, unhelpful, unoccupied,
   unsuitable, unusable, unworkable