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simper (verb) smile in a silly and annoying manner.
When somebody simpers they smile in a silly manner that makes you angry. They smile for almost no reason and that annoys you.
- Betty simpered at her father as he spoke seriously to her. Her smiling in a silly and simpering manner irritated him.
- Jack simpered when his teacher told him to do better at studies. His smiling meaninglessly when the teacher was serious really annoyed her.