Mr. Stelling was a well-sized, broad-chested man, not yet thirty, with flaxen hair standing erect, and large lightish-gray eyes, which were always very wide open; he had a sonorous bass voice, and an air of defiant self-confidence inclining to brazenness.
There are no more uses of "sonorous" in the book.
Show samples from other sources
The candidate discussed weighty matters in rich, sonorous tones.
I prefer traditional sonorous chords to the dissonant chords with which she likes to experiment.