stentorian (adj.)

• blaring
• booming
• clamorous
• deafening
• earsplitting
• earthshaking
• forte
• fortissimo
• full
• gravelly
• loud
• loud-voiced
• orotund
• pealing
• piercing
• plangent
• resounding
• ringing
• roaring
• rough
• sonorous
• thunderous
• vociferous