simper
verb
[ ˈsɪmpə ]
• smile in an affectedly coy or ingratiating manner.
• "she simpered, looking pleased with herself"
simper
noun
• an affectedly coy or ingratiating smile.
• "an exaggerated simper"
Origin:
mid 16th century: of unknown origin; compare with German zimpfer ‘elegant, delicate’.