Definition of toneless adjective from the Oxford Advanced Learner's Dictionary

 

toneless

 adjective
adjective
BrE BrE//ˈtəʊnləs//
 
; NAmE NAmE//ˈtoʊnləs//
 
 
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(of a voice, etc.) dull or flat; not expressing any emotion or interest
See the Oxford Advanced American Dictionary entry: toneless