Simper (verb)

1. To smile or speak in a silly or affected manner.
2. To speak or act in a way that is overly sweet or ingratiating.

Origin:

The origin of simper is uncertain, it may come from middle english sippen "to sip" or from old english sċipere "smiler". .

Examples:

1. She simpered at him, batting her eyelashes.
2. The woman simpered as she spoke, trying to be charming.
3. He simpered and fawned over the boss in hopes of getting a promotion.
4. She simpered and giggled, trying to be flirtatious.
5. The actor simpered through his lines, failing to convey any emotion.