in a bad mood and not speaking, either on a particular occasion or because it is part of your character 面有愠色的；闷闷不乐的；郁郁寡欢的 Bob looked pale and sullen. 鲍勃脸色苍白，闷闷不乐。 She gave him a sullen glare. 她满脸不高兴地瞪了他一眼。 sullen teenagers 面色阴郁的青少年 He lapsed into a sullen silence. 他陷入了阴郁的沉默。
- (literary)
(of the sky or weather 天空或天气 dark and unpleasant 阴沉的 a sullen grey sky 阴沉的灰色天空
Word OriginMiddle English (in the senses ‘solitary, averse to company’, and ‘unusual’): from Anglo-Norman French sulein, from sol ‘sole’.