ashamed, conscience-stricken
媿 centers on a deep, internal sense of shame or moral unease: feeling ashamed or conscience-stricken.
媿 combines 女 (woman) with 鬼 (demon, ghost), likely expressing a sense of shame or moral discomfort through the idea of a woman feeling haunted or troubled.
A woman 女 beside a demon 鬼: imagine a woman feeling so ashamed that she feels a demon-like presence watching her, making her conscience-stricken.
For キ, picture a woman feeling so ashamed she can only manage a tiny, key-like squeak: key -> キ, and her conscience is locked up with shame.