A sensitive performance is required to keep the music from sounding monotonous.

The drilling sounded monotonous and familiar as the buzzing of an insect.

Mr. Sidney said radio these days has come to sound mechanical and monotonous, with stations struggling to follow all kinds of rules.

To some the idea of looking at galleries filled with nothing but canvases with spots on them sounds mind-numbingly monotonous.

Even Dustin Hoffman sounded oddly monotonous as he presented the best-picture award.

His voice can sound monotonous at the best of times.

But in fact the music came out sounding monotonous.

ConcreteLoop.com gave D.N.A. a mostly positive review, stating the album "is refreshingly different in a sea of R&B that tends to sound a little monotonous."

"The recitative facilitates comprehension, but with a few beautiful exceptions it cannot escape sounding monotonous."

Her tone sounded monotonous to him.