unsonorous

He was stout, and when he alighted from his carriage, he moved away with a somewhat waddling gait, and lifted up a rasping, high-pitched voice in unsonorous complaint against a slave who let fall a parcel of baggage.

A Friend of Caesar A Tale of the Fall of the Roman Republic. Time, 50-47 B.C. William Stearns Davis 1903

I have, however, little doubt, that from small quantities the sound evoked by the foot on the shore may be reproduced: enough will lie within the reach of experiment to demonstrate the strange difference which exists between this sonorous sand of the Oölite, and the common unsonorous sand of our sea-beaches; and it is certainly worth while examining into the nature and producing causes of a phenomenon so curious in itself, and which has been characterized by one of the most distinguished of living philosophers as "the most celebrated of all the acoustic wonders which the natural world presents to us."

The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland Hugh Miller 1829