If he weakly showed the least disposition to hear it, Captain Hopkins, in a loud sonorous voice, gave him every word of it.
He preceded us to the dining-room — the first room I had entered in that house — and flinging open the door of Mr. Wickfield’s former office, said, in a sonorous voice: ’Miss Trotwood, Mr. David Copperfield, Mr. Thomas Traddles, and Mr. Dixon!’
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.