scowler

/ˈskaʊlər/
noun
  1. A person who makes an angry or unhappy expression by lowering their eyebrows and pulling their mouth into a frown.
    • Don't be such a scowler — try to smile more.
    • The teacher was a constant scowler, making the students nervous.
    • The old scowler at the corner store never greeted anyone.
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