mental dullness 智力迟钝
the dullness of color 色彩暗淡
dullness of mind 思维迟钝
A: Why did you leave the meeting so early?
A：你为什么这么快就离开会议了？
B: The dullness of the presentation was unbearable.
B：演示内容的乏味实在让人无法忍受。
1) 乏味，无趣
2) 暗淡，无光泽
3) 迟钝，笨拙
1. 乏味，无趣
noun
1. The quality of being boring or lacking interest.
Synonym: boredom, monotony