The Collaborative International Dictionary of English v.0.48:
Egotistically \E`go*tis"tic*al*ly\, adv. With egotism. [1913 Webster]WordNet (r) 3.0 (2006):
egotistically adv 1: in an egotistical manner; "he behaved egotistically" [syn: egotistically, selfishly] [ant: unselfishly]