smirk
verb [intransitive]to smile in a silly or unpleasant way that shows that you are pleased with yourself, know something that other people do not know, etc. 自鸣得意地笑;傻笑 It was hard not to smirk. 让人忍俊不禁。 He smirked unpleasantly when we told him the bad news. 我们把坏消息告诉他时,他脸上现出一丝奸笑。 She smirked to herself as she walked away. 她走开时对自己傻笑。 What are you smirking at? 你在偷偷笑什么?
Word OriginOld English sme(a)rcian, from a base shared by smile. The early sense was ‘to smile’; it later gained a notion of smugness or silliness.