The Collaborative International Dictionary of English v.0.48:
Conceitedly \Con*ceit"ed*ly\, adv. 1. In an egotistical manner. [1913 Webster] 2. Fancifully; whimsically. [1913 Webster]WordNet (r) 3.0 (2006):
conceitedly adv 1: with conceit; in a conceited manner; "he always acts so conceitedly!" [syn: conceitedly, self-conceitedly]