Collins Chinese Dictionary Plus (3rd edition), 2011:
vain [veɪn]
adj
1
(=conceited)
[+ person] 自负(負)的 zìfù de
[+ person] 自负(負)的 zìfù de
2
(=useless)
[+ attempt, action, hope] 徒劳(勞)的 túláo de
[+ attempt, action, hope] 徒劳(勞)的 túláo de
- in vain
徒然 túrán
- to die in vain
白白死去 báibái sǐqù
在这些条目还发现'vain'：
在英文解释里：
bark at the moon
- boasting
- coxcomb
- fop
- go on a wild goose chase
- narcissist
- narcissistic
- peacock
- popinjay
- preen
- prima donna
- self-important
- snotty-nosed
- to no avail
- vanity fair
- without success
中文：