But most of the time, especially on this last day, Merry had ridden by himself just behind the king, saying nothing, and trying to understand the slow sonorous speech of Rohan that he heard the men behind him using.
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.