flatness
noun [ U ] uk/ˈflæt.nəs/ us/ˈflæt.nəs/
(LEVEL QUALITY)
平坦
the quality of being level and without curved, high, or hollow parts
The flatness of the desert was broken only by a few large piles of rocks. 沙漠看上去很是平坦，仅有几大堆石头点缀其中。
(NO EMOTION)
平淡；乏味
the fact that someone or something shows no emotion or interest
All the critics remarked on the flatness of the performance. 所有的评论家都谈到这场表演平淡乏味。