Characterized by fullness, clearness, strength, and smoothness; ringing and musical; -- said of the voice or manner of utterance.

The orotund voice or utterance

ostentatiously lofty in style; "a man given to large talk"; "tumid political prose"

(of sounds) full and rich; "orotund tones"; "the rotund and reverberating phrase"; "pear-shaped vowels"