Source : Webster's Revised Unabridged Dictionary (1913)

Infertile \In*fer"tile\, a. [L. infertilis: cf. F. infertile.
   See {In-} not, and {Fertile}.]
   Not fertile; not productive; barren; sterile; as, an
   infertile soil.

Source : WordNet®

infertile
     adj : incapable of reproducing; "an infertile couple" [syn: {sterile},
            {unfertile}] [ant: {fertile}]