steely gaze
A prolonged and intense, mirthless look, especially one expressing disapproval or displeasure. The kids began joking about their classmate's situation, but the teacher silenced them with a steely gaze. I could tell by his steely gaze that he was not happy about the news.
steely gaze
Cliché an intense, staring gaze. The principal turned a steely gaze toward the frightened student and suddenly smiled.