Glower (verb)
glou-er
to look or stare with sullen dislike, discontent, or anger.
First recorded in 1350–1400; Middle English (Scots ) glowren “to glower”; akin to Middle Low German glūren “to be overcast,” Middle Dutch gloeren “to leer”
Example sentences
“I guess we can stand it if you can,” Mollie responded lightly, which only caused him to glower the more.”