scowl
noun
°The wrinkling of the brows or face in frowning; the expression of displeasure, sullenness, or discontent in the countenance; an angry frown.
°Hence, gloom; dark or threatening aspect.
verb
°To wrinkle the brows, as in frowning or displeasure; to put on a frowning look; to look sour, sullen, severe, or angry.
°Hence, to look gloomy, dark, or threatening; to lower.