1. 不鲜明的，不清楚的　 not bright or clear
2. 迟钝的，呆笨的　 slow in understanding; stupid
3. 枯燥无味的，令人厌烦的，单调的　 lacking interest or excitement; boring; monotonous
4. 不锋利　 not sharp
5. 感觉不明显　 (of pain) not felt sharply
6. 萧条的，清淡的　 (of trade) not busy; slow

　～ class　迟钝的一班
　～ colour　暗淡的颜色
　～ glow　昏暗的光
　～ man　头脑简单的人
　～ mind　迟钝的头脑
　～ pupil　迟钝的学生
　～ in appearance　外表呆板
　～ of hearing　听觉不灵
　～ of understanding　理解迟钝

　He is a very dull pupil.　他是一个很笨的学生。
　All work and no play made Jack a dull boy.　只会学习，不会玩，杰克变成了笨小孩。
　I'm in dull mood.　我觉得闷得慌。
　The weather is dull.　天气阴沉。
　The knife is dull.　那把小刀很钝。
　Business is deplorably dull.　生意极为不景气。
　The day was dull with a cloudy sky.　天气阴暗多云。
　I dare say you are dull at home.　我敢说你在家里感到很无聊。
　The TV play was so dull that I didn't finish it.　这部电视剧极其单调，我没看完。
　The knife is so dull that it will not cut.　刀子太钝了，割不开东西。
　Martin found the hospital routine slightly dull.　马丁感到医院的日常工作有点单调乏味。

 ♣ as dull as ditch-water
　极沉闷乏味的　very boring
　The Andersons are very hospitable and mean to be kind, but, really, an evening spent with them is as dull as ditch-water.　安德逊夫妇很好客，又很善良，但说真的，跟他们呆一晚上实在乏味。

 ♣ dull, bored, boring
　参见boring条。

　［同义词］ boring, dreary, inactive, lifeless, spiritless, stupid, tedious, tiresome, uninteresting
　［反义词］ bright, clever, imaginative, interesting, spirited
　［词源］　古英语dol（呆笨的）