adj.自負(fù)的；徒勞的；無(wú)效的；虛榮的

She is vain of her voice. 她自以為她的聲音了不起。

They endeavoured to make her happy but in vain. 他們盡量使她快樂(lè)，卻徒勞無(wú)功。

All his father's exhortations were in vain. 他父親的一切勸告都無(wú)效。

We tried in vain to make him change his mind. 我們想使他改變主意，結(jié)果是白費(fèi)心機(jī)。

The world had made him extravagant and vain. 世俗使他變得放蕩不羈，虛榮自負(fù)。

She is so vain that she can't pass a mirror without looking into it. 她好愛(ài)虛榮,每經(jīng)過(guò)一面鏡子都要照一下。

adv.徒勞地

adj.非常自負(fù)的；虛榮心強(qiáng)的

n.極度自負(fù)；虛榮