scowl 
(skoul)
(skoul)v. scowled, scowl·ing, scowls
v.intr.
To wrinkle or contract the brow as an expression of anger or disapproval. See Synonyms at frown.
v.tr.
To express (displeasure, for example) with a frowning facial expression.
n.
A look of anger or frowning disapproval.
[Middle English scoulen, probably of Scandinavian origin.]
scowler n.
scowling·ly adv.