A parvenu is a person of obscure origin who has gained wealth or a high position; an upstart, in other words.

暴发户是出身卑微的人， 获得了财富或高位； 换句话说，一个暴发户。

A word of obscure origin, copacetic has for over a century satisfied those who've had a hankering to describe that which is hunky-dory or otherwise completely satisfactory.

一个多世纪以来，“copacet”一词的起源并不为人所知，它满足了那些渴望描述美好事物或完全令人满意的事物的人们的需求。

If feeling that " of obscure origin" is the best we can do for copacetic, take a look at the long etymological note at the entry for copacetic at mariam-webster.com for a discussion of the word's history.

如果觉得“起源不明” 是我们能为 copacet 做的最好的事情，请查看 mariam-webster.com 上的 copacet 条目中的长词源注释，以讨论该词的历史。