Source : Webster's Revised Unabridged Dictionary (1913)

Downcast \Down"cast`\, a.
   Cast downward; directed to the ground, from bashfulness,
   modesty, dejection, or guilt.

         'T is love, said she; and then my downcast eyes, And
         guilty dumbness, witnessed my surprise.  --Dryden.
   - {Down"cast`ly}, adv. -- {Down"cast`ness}, n.