Sonorous

adjective

1.giving out or capable of giving out a sound, especially a deep, resonant sound, as a thing or place: a sonorous cavern.

2.loud, deep, or resonant, as a sound.

3.rich and full in sound, as language or verse.

4.high-flown; grandiloquent: a sonorous speech.

 

 4.  eloquent, florid, grandiose, orotund