Of a sound, voice, etc.: resembling a roar; extremely loud.

Having a loud or full voice or sound; sounding or talking loudly, or with great enthusiasm, vigour, etc. Of a sound: loud or sonorous.

Having a deep or sonorous voice: esp. of dogs.

Having a full mouth; sounding loudly. Obsolete.

Possessing healthy or powerful lungs.

Characterized by shouting. Of a person: inclined to shout, habitually shouting. Of a sound (esp. the human voice): having a harsh quality…

That utters stentorian sounds.

‘having a tongue vociferous as a trumpet’ (Johnson), loud-voiced.

(a) = trumpet-tongued adj., trumpet-voiced adj. at compounds 2c; (b) having a wide opening like the mouth of a trumpet.