The Collaborative International Dictionary of English v.0.48:
Simperingly \Sim"per*ing*ly\, adv. In a simpering manner. [1913 Webster]WordNet (r) 3.0 (2006):
simperingly adv 1: with a lack of courage and determination; "simperingly, the accused begged for mercy" [syn: pusillanimously, simperingly]