sonorous

adjective4

1. •
   Capable of giving out a deep, resonant sound.

   • The highlight of the hike was the sonorous cave, which produced a ringing echo from the hiker’s shouts.
2. •
   Full of sound and rich, as in language or verse.

   • He was selected to give the opening speech thanks to his imposing, sonorous voice.
3. •
   Wordy or grandiloquent.
4. •
   Produced with a relatively open vocal tract and relatively little obstruction of airflow.

   • Vowels are more sonorous (acoustically powerful) than consonants, and so we perceive them as louder and lasting longer. — 2001