stentorian

1. (of a voice) Loud, powerful, booming, suitable for giving speeches to large crowds.Examples: "Shouts of laughter were elicited, smart biddings drawn out, from the whispers of a timid miss, to the stentorian voice of a fox-hunting squire, and not a few fracas from parties either contending for a supposed prize, or disclaiming their chance for it,..."; "There seemed no one to dispute his claims when he said, or rather shouted, in stentorian tones: "I am Tsa. This is my she. Who wishes her more than Tsa?""; "But whenever one of the motor-trucks lumbering by bore a big U.S. on its rear panel Troy pushed his light ambulance ahead and skimmed past, just for the joy of seeing the fresh young heads rising pyramid-wise about the sides of the lorry, hearing the snatches of familiar songs—"Hail, hail, the gang's all here!" and "We won't come back till it's over over here!"—and shouting back in reply to a stentorian "Hi, kid, beat it!", "Bet your life I will, old man!""

2. (by extension) Stern, authoritarian; demanding of respect.broadly