vacillate（evacuate：撤离
If you vacillate between two alternatives or choices, you keep changing your mind
vacuous：空洞
If you describe a person or their comments as vacuous, you are critical of them because they lac intelligent thought or ideas
vanity：虚荣心
If you refer to someone’s vanity, you are critical of them because they take great pride in their appearance or abilities
vain：徒劳的
- A vain attempt or action is one that fails to achieve what was intended
- If you describe a hope that something will happen as a vain hope, you mean that there is no chance of it happening
- If you describe someone as vain, you are critical of their extreme pride in their own beauty, intelligence, or other good qualities
- If you do something in vain, you do not succeed in achieving what you intend
- If you say that something such as someone’s death, suffering, or effort was in vain, you mean that it was useless because it did not achieve anything
vainglorious：虚荣
If you describe someone as vainglorious, you are critical of them because they are very proud of what they have done and boast a lot about it
evanescent：渐逝）
Something that is evanescent gradually disappears from sight or memory
vagrancy（vague：模糊
Vagrancy is a way of life in which someone moves a lot from place to place because they have no permanent home or job, and have to ask for steal things in order to live
vogue：时尚
- If there is a vogue for something, it is very popular and fashionable
- If something is in vogue, it is very popular and fashionable. If it comes into vogue, it becones very popular and fashionable
vagary：奇思妙想
Vagaries are unexpected and unpredictable changes in a situation or in someone’s behavior that you have no control over
extravagant：奢侈） - Someone who is extravagant spends more money than they can afford or uses more of something than is reasonable
- Something that is extravagant costs more money than you can afford or uses more of something than is reasonable
- Extravagant behavior is extreme behavior that is often done for a particular effect
- Extravgant claims or ideas are unrealistic or impractical
