Source : Webster's Revised Unabridged Dictionary (1913)

Mothy \Moth"y\, a.
   Infested with moths; moth-eaten. ``An old mothy saddle.''
   --Shak.

Source : WordNet®

mothy
     adj 1: worn or eaten away by (or as if by) moths; "moth-eaten
            blankets" [syn: {moth-eaten}]
     2: infested with moths
     [also: {mothiest}, {mothier}]