The Collaborative International Dictionary of English v.0.48:
Overwhelming \O`ver*whelm"ing\, a. Overpowering; irresistible. -- O`ver*whelm"ing*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
overwhelmingly adv 1: incapable of being resisted; "the candy looked overwhelmingly desirable to the dieting man" [syn: overwhelmingly, overpoweringly, irresistibly]