Source : Webster's Revised Unabridged Dictionary (1913)

Prosy \Pros"y\, a. [Compar. {Prosier}; superl. {Prosiest}.]
   1. Of or pertaining to prose; like prose.

   2. Dull and tedious in discourse or writing; prosaic.

Source : WordNet®

prosy
     adj : lacking wit or imagination; "a pedestrian movie plot" [syn:
           {pedestrian}, {prosaic}, {earthbound}]
     [also: {prosiest}, {prosier}]