vain的解释

1. 自负的，自视过高的，自高自大的
2. 徒然的，徒劳的，无结果的，枉然的
3. 无益的
4. 爱虚荣的
5. 炫耀的
6. 空虚的
7. 无意义的，无价值的
8. 无效的，没效果的
9. 愚蠢的

1. 未用空间

1. characteristic of false pride; having an exaggerated sense of self-importance;

   "a conceited fool"
   "an attitude of self-conceited arrogance"
   "an egotistical disregard of others"
   "so swollen by victory that he was unfit for normal duty"
   "growing ever more swollen-headed and arbitrary"
   "vain about her clothes"
   

2. unproductive of success;

   "a fruitless search"
   "futile years after her artistic peak"
   "a sleeveless errand"
   "a vain attempt"
   

1.徒劳的;无效的;不成功的
Avain attempt or action is one that fails to achieve what was intended.

vain什么意思

e.g. The drafting committee worked through the night in avain attempt to finish on schedule...
起草委员会为按计划完成草案已通宵加班，但结果仍是徒劳。
e.g. I was singing in avain effort to cheer him up.
我唱歌试图让他高兴起来，结果是白费力气。

2.徒然的;无望的
If you describe a hope that something will happen as avain hope, you mean that there is no chance of it happening.

e.g. He married his fourth wife, Susan, in thevain hope that she would improve his health.
他娶了第四个老婆苏珊，徒然希望她能使他健康状况好转。

3.自负的;虚荣的;自命不凡的
If you describe someone asvain, you are critical of their extreme pride in their own beauty, intelligence, or other good qualities.

e.g. I think he is shallow,vain and untrustworthy.
我认为他浅薄虚荣，不可信任。

4.徒劳;白费力气
If you do somethingin vain, you do not succeed in achieving what you intend.

e.g. He stopped at the door, waiting invain for her to acknowledge his presence...
他在门口停住，徒然地等待她和自己打招呼。
e.g. It became obvious that all her complaints were invain.
很明显她所有的抱怨都是白费口舌。

5.无用的;无意义的;无价值的
If you say that something such as someone's death, suffering, or effort wasin vain, you mean that it was useless because it did not achieve anything.

e.g. He wants the world to know his son did not die invain.
他想让全世界都知道，他的儿子不是白白死去的。

• be vain about〔of〕为…而自负

• All literature, art, and science are vain..if they do not enable you to be glad.

  出自：J. Ruskin

• It is..vain to try to be other than we are.

  出自：D. M. Frame

• The vain attempts of feminist critics to prove there is a..'women's language'.

  出自：New York Review of Books

• ☆ 直接源自古法语的vain，意为没有价值的；最初源自拉丁语的vanus，意为空着的。