toneless Synonyms

devoid of feeling surd sounding soporific soniferous pale neutral monotone lifeless lackluster indifferent indeterminate tedious uninteresting devoid of emotion unvoiced unvocalized uncolored sing-song emotionless deadpan unuttered unmodulated uninflected achromous impersonal impassive icy dispassionate dead cool colorless cold-blooded cold boring blank bland aphonous aphonic drab dreary humdrum hueless hollow frigid flatter flat featureless faded expressionless