
Monotone
Lack of Emotion
Monotone voices are often perceived as lacking emotion or enthusiasm.

He answered the phone with a monotone 'hello', sounding disinterested.
Boredom Effect
Using a monotone voice might unintentionally cause listeners to feel bored.

The lecturer's monotone speech made the students yawn.
Robotic Tone
A monotone voice can sound robotic, lacking the usual ups and downs of speech.

Her monotone recital made her sound like a robot.
Compare with
BoreDullFlatHumdrumInterestingMonotonousTediousUnvarying
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