The Collaborative International Dictionary of English v.0.48:
Smilingly \Smil"ing*ly\, adv. In a smiling manner. --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
smilingly adv 1: with smiles; in a smiling manner; "the girl reminded her smilingly of their childhood spent together" [ant: unsmilingly]