The Collaborative International Dictionary of English v.0.48:

Uninventive \Uninventive\
   See inventive.

WordNet (r) 3.0 (2006):

uninventive
    adj 1: deficient in originality or creativity; lacking powers of
           invention; "a sterile ideology lacking in originality";
           "unimaginative development of a musical theme";
           "uninspired writing" [syn: sterile, unimaginative,
           uninspired, uninventive]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "uninventive":
   arid, barren, derivative, dry, dull, earthbound, infecund,
   infertile, literal, mundane, noncreative, nongerminal, nonseminal,
   prosaic, prosing, prosy, staid, sterile, stolid, stuffy,
   uncreative, unfanciful, unideal, unimaginative, uninspired,
   unoriginal, unpoetic, unpregnant, unromantic, unromanticized