Source : Webster's Revised Unabridged Dictionary (1913)

Scabby \Scab"by\, a. [Compar. {Scabbier}; superl. {Scabbiest}.]
   1. Affected with scabs; full of scabs.

   2. Diseased with the scab, or mange; mangy. --Swift.

Source : WordNet®

scabby
     adj : covered with scabs
     [also: {scabbiest}, {scabbier}]

scabbier
     See {scabby}