But he could hear nothing except a low monotone, the words of which were indistinguishable.

John Quincy heard the low monotone of their voices in the distance.

After the fourth pass, he began talking to himself in a low, rapid monotone.

Then she spoke again in a low monotone, words that were foreign and incomprehensible to me but seemed to mean something to her.

"Kill the men and keep the woman," said the massive man in a low monotone.

As was his habit, Hills had been talking in a low monotone.

Carl answered in a low monotone, his eyes on the pavement.

Now he could catch words, muttered in a low monotone.

His voice was a low monotone and she had trouble concentrating.

For hours she spoke in a low monotone, of everything she knew.