The Collaborative International Dictionary of English v.0.48:

Fenowed \Fen"owed\, a. [AS. fynig musty, fynegean to become
   musty or filthy: cf. fennig fenny, muddy, dirty, fr. fen fen.
   Cf. Finew.]
   Corrupted; decayed; moldy. See Vinnewed. [Obs.] --Dr.
   Favour.
   [1913 Webster]