glower
     n : an angry stare [syn: {glare}]
     v 1: look at with a fixed gaze; "The girl glared at the man who
          tried to make a pass at her" [syn: {glare}]
     2: look angry or sullen, wrinkle one's forehead, as if to
        signal disapproval [syn: {frown}, {lour}, {lower}]
Source: WordNet® 2.0