1.徒然的,无益的,没效果的;愚蠢的;不足道的
2.空的,空虚的;虚有其表的,表面好看的,虚饰的
3.自夸的,自负的;爱虚荣的
1.someone who is vain is very proud and thinks they are very attractive or special
2.unsuccessful, or useless
1.1The English seem as silent as the Japanese, yet vainer than the inhabitants of Siam.
英国人一如沉默的日本人,但又胜过自负的泰国人。