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Adjective: scowling  skaw-(u-)ling
  1. Sullen or unfriendly in appearance
    "The scowling bouncer intimidated would-be troublemakers";
    - beetle-browed
Verb: scowl  skaw(-u)l
  1. Frown with displeasure
    "The teacher scowled at the misbehaving students"

See also: unfriendly

Type of: frown, glower, lour, lower[2]

Encyclopedia: Scowl