Definition of "unmelodious"

Prussian Trenck […] jargons and jangles in an unmelodious manner.

1837, Thomas Carlyle, The French Revolution: A History […], volumes (please specify |volume=I to III), London: Chapman and Hall, (please specify the book or page number)

Watt listened for a time, for the voice was far from unmelodious.

1953, Samuel Beckett, Watt, 1st American edition, New York, N.Y.: Grove Press, published 1959