Source : Webster's Revised Unabridged Dictionary (1913)

Crummy \Crum"my\ (kr?m"m?), a.
   1. Full of crumb or crumbs.

   2. Soft, as the crumb of bread is; not crusty.

Source : WordNet®

crummy
     adj : of very poor quality [syn: {bum}, {cheap}, {cheesy}, {chintzy},
            {punk}, {sleazy}, {tinny}]
     [also: {crummiest}, {crummier}]