adj.
自负的; 爱慕虚荣的 thinking too highly of ones appearance, abilities, etc.; conceited
徒劳的,无用的,无效的 useless or futile
同义词
a. conceited，egotistic，fruitless，futile
词汇辨析
haughty，proud，arrogant，vain
这些形容词都有 骄傲的，傲慢的 之意。
haughty 较正式用词，多用于贬义。指对身份或地位比自己低的人采取冷淡、轻视或鄙互的态度。
proud 含义广，普通用词。褒义指自豪和荣耀以及强烈的自尊;贬义则指傲慢，自以为是或自鸣得意。
arrogant 用于贬义，指过高估计自己，以致骄傲自大或傲慢无礼，目中无人。
vain 指一个对自己的外表或对自己留给别的印象太过分地关注，以致自命不凡，自鸣得意。
参考例句
1. One that many loved in vain.
许多姑娘爱他也都徒然。
2. Favour is deceitful, and beauty is vain.
宠爱是欺诈的，美丽是空虚的。
3. Was it all in vain?
这切都是徒劳的吗?
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