toneless
adj. 单调的；沉闷的
副词：tonelessly 名词：tonelessness
近义词：colourless，colorless，expressionless，monotonous，neutral，monochrome，dull，toned，
英英释义
Adjective
- lacking in tone or expression;
"his toneless mechanical voice"
例句
- I tried to be open-minded about the rock concert, but the music was at best loud and at worst toneless.对这场摇滚音乐会我要尽量思想开放些，但是其乐声充其量响度很高，更糟糕的是很不悦耳。