English version

toneless in Linguistics topic

From Longman Dictionary of Contemporary Englishtonelesstone‧less /ˈtəʊnləs $ ˈtoʊn-/ adjective  SLa toneless voice does not express any feelings syn expressionless ‘I’m sorry, ’ he said, in a flat toneless voice.
Examples from the Corpus
tonelessThe chairman's voice was firm but toneless.His toneless voice caught fire and was blessed with new colour and depth.