The Collaborative International Dictionary of English v.0.48:

Infecund \In*fec"und\, a. [L. infecundus: cf. F. inf['e]cond.
   See In- not, and Fecund.]
   Unfruitful; not producing young; barren; infertile. [Obs.]
   --Evelyn.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "infecund":
   acarpous, arid, barren, celibate, childless, desert, desolate,
   drained, dried-up, dry, dull, earthbound, effete, exhausted,
   fallow, fruitless, gaunt, gelded, impotent, ineffectual, infertile,
   issueless, jejune, leached, literal, menopausal, mundane,
   nonfertile, nonproducing, nonproductive, nonprolific, prosaic,
   prosing, prosy, regrettable, sine prole, staid, sterile, stolid,
   stuffy, sucked dry, teemless, uncultivated, unfanciful, unfertile,
   unfruitful, unideal, unimaginative, uninspired, uninventive,
   unoriginal, unplowed, unpoetic, unproductive, unprolific,
   unromantic, unromanticized, unsown, untilled, virgin, waste,
   wasted, without issue