adj.不快乐的；悲伤的；阴郁的
His mouth corners curved in his highly individual, cold, almost mirthless smile . 他嘴角一抿，露出极为独特的，几乎是闷闷不乐的淡笑。
We have been fed up with the mirthless routine work all day long. 我们受够了整天沉闷的日常工作。
