simper

To simper is to smile in a coy, affected, self-conscious, or somewhat silly way. It is not the bright, open smile of real joy. Instead, it is usually a small smile that seems forced, overly sweet, or meant to create a certain impression.

The word usually has a negative tone. It suggests that someone is trying too hard to look innocent, pleasing, modest, or attractive. A simper is often less about real feeling and more about appearance. The person may be showing off, seeking approval, flirting in an affected way, or acting falsely sweet.

Historically, the word often suggested foolishness, vanity, or weak affectation. That sense is still there in many uses today. You might describe someone as "simpering" when they give empty compliments, smile in a coy way to get attention, or act unnaturally meek and pleasing. Writers such as Jane Austen used simper for characters whose manners felt affected rather than sincere.

So, if you see someone wearing a little smile that feels false, silly, or overly practiced, they may be simpering. The expression often tells you that the person is not simply happy. They are trying to look a certain way, and that effort shows on their face.