toneless

1. 1.

   Lacking tone or expression.

   缺乏语调或表情的；平淡的

2. 2.

   Lacking vitality; listless; lifeless.

   缺乏活力的；无精打采的；死气沉沉的

3. 3.

   Lacking tone or pitch, have the neutral tone.

   无声调或音高的,为中性调(轻声)的

缺乏活力的；无精打采的；死气沉沉的；无声调或音高的,为中性调(轻声)的；缺乏声调的；单调的；沉闷的