Stentorian [stĕn-tôr’ē-ən] refers to something extremely loud or powerful, usually a voice. Stentor was a herald in the Iliad, and he had a powerful voice. That is where the term comes from.
The blatant disregard for Human Rights, the stentorian racism and unashamed nepotism displayed by Mugabe and his pathetic goons is allowed to continue because of some mystical allegiance to the old African leadership club. (The Economist)
Watching an avalanche from a distance or hearing the stentorian cracking boom of a calving iceberg are unforgettable experiences. (USA Today)