Source : Webster's Revised Unabridged Dictionary (1913)

Overpowering \O`ver*pow"er*ing\, a.
   Excelling in power; too powerful; irresistible. --
   {O`ver*pow"er*ing*ly}, adv.

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®

overpowering
     adj : so strong as to be irresistible; "an overpowering need for
           solitude"; "the temptation to despair may become
           overwhelming"; "an overwhelming majority" [syn: {overwhelming}]