The Collaborative International Dictionary of English v.0.48:
Simperer \Sim"per*er\, n. One who simpers. --Sir W. Scott. [1913 Webster] A simperer that a court affords. --T. Nevile. [1913 Webster]WordNet (r) 3.0 (2006):
simperer n 1: a smiler whose smile is silly and self-conscious and sometimes coy