阔气的英文：
luxurious; extravagant; lavish; opulent

参考例句：

That's true. And he tries to keep up with the Joneses.
确实如此。况且他还想跟邻居比阔气。

In recent years those peasants who were often referred to as hayseeds become much richer than those citizens.
近年来,有些被称为乡巴佬的农民们比城里的人都阔气．

Don’t you know that no man in the land ought to live better than the king?
难道你不知道，在这个国家里，任何人都不应该比国王住得更阔气吗

Pierpont Morgan, perhaps the most flamboyant of the entrepreneurs, operated on a scale of magnificence
皮尔庞特?摩根或许是企业家当中最阔气的。他的经营规模庞大。

Tom had no handkerchief, and he looked upon boys who had, as snobs
汤姆没有手巾，他认为有手巾的孩子们都是些装阔气的势利鬼。

luxurious是什么意思：
adj. 豪华的，奢侈的

The quota on luxury item have is revoke.
奢侈品限额已被撤消。

Few could afford the luxury.
很少有人买得起这种奢侈品。

He was reared in the lap of luxury.
他在奢侈的环境中长大。

extravagant是什么意思：
adj. 奢侈的；过分的；放肆的

She is vain and extravagant.
她既爱虚荣又奢侈。

She is extravagant in dress.
她衣着华丽。

extravagant or affected feeling or emotion.
夸张的或假装的感情。

lavish是什么意思：
adj. 盛大的，奢侈的；过分慷慨的；浪费的
v. 浪费；滥用；过分慷慨地给予

The sets and costumes are lavish.
布景和服装极尽奢华。

A chinchilla robe of sybaritic lavishness was draped over the bed.
奢华的栗鼠皮毛毯覆盖在床上。

The country girl was not used to their lavish mode of living
这个乡下姑娘不习惯他们奢侈的生活方式。