The Collaborative International Dictionary of English v.0.48:

Infortunate \In*for"tu*nate\ ([i^]n*f[^o]r"t[-u]*n[asl]t), a.
   [L. infortunatus.]
   Unlucky; unfortunate. [Obs.] --Shak. "A most infortunate
   chance."                                       --Howell.
   [1913 Webster] -- In*for"tu*nate*ly, adv. [Obs.]
   [1913 Webster]