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]