sternly

The chair sternly rebuked the audience for their laughter.

The teacher sternly warned the students to stop talking during the exam.

She looked at him sternly, making it clear that she was not joking.

The manager spoke sternly to the employees about the importance of meeting deadlines.

The officer told the suspect sternly to put his hands up.

She was reprimanded sternly for arriving late to work.

The judge looked at the defendant sternly before delivering the verdict.

The coach spoke sternly to the players after their poor performance in the game.

The boss addressed the team sternly about the need for better communication.

The principal spoke sternly to the students about the vandalism on school property.