Source : Webster's Revised Unabridged Dictionary (1913)

Selfishly \Self"ish*ly\, adv.
   In a selfish manner; with regard to private interest only or
   chiefly.

Source : WordNet®

selfishly
     adv : in an egotistical manner; "he behaved egotistically" [syn: {egotistically}]
           [ant: {unselfishly}]