Toneless
/ˈtəʊnləs/
Definition 1 of 2
Pro Tip 1/3Lack of Melody
Refers specifically to sound that lacks variation in pitch, not just volume or pace. 
Even the most exciting story sounds uninteresting in a toneless delivery.
Pro Tip 2/3Not Musical
Indicates an absence of any melodious qualities that you would typically find in music. 
The beginner's violin recital was a challenge to listen to, quite toneless.
Pro Tip 3/3Neutral Sound
Describes a voice that does not hold any identifiable emotion or mood. 
The dispatcher's toneless voice was calm, revealing no panic during the emergency. Compare with
DeadpanDullEmotionalExpressionFlatLifelessMonotonousUninspiring
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