Source : Webster's Revised Unabridged Dictionary (1913)

Overpower \O`ver*pow"er\, v. t. [imp. & p. p. {Overpowered}; p.
   pr. & vb. n. {Overpowering}.]
   To excel or exceed in power; to cause to yield; to vanquish;
   to subdue; as, the light overpowers the eyes. ``And
   overpower'd that gallant few.'' --Wordsworth.

   Syn: To overbear; overcome; vanquish; defeat; crush;
        overwhelm; overthrow; rout; conquer; subdue.

Source : WordNet®

overpowered
     adj : rendered powerless especially by an excessive amount or
           profusion of something; "a desk flooded with
           applications"; "felt inundated with work"; "too much
           overcome to notice"; "a man engulfed by fear"; "swamped
           by work" [syn: {flooded}, {inundated}, {overcome}, {overwhelmed},
            {swamped}, {engulfed}]