WordNet sense 1 (free of or using methods to keep free of pathological microorganisms):

aseptic

WordNet sense 2 (not bearing offspring):

barren

WordNet sense 3 (incapable of reproducing):

infertile, unfertile

WordNet sense 4 (deficient in originality or creativity; lacking powers of invention):

unimaginative, uninspired, uninventive

WordNet sense 5 (not creative):

uncreative