English equivalent for 'تازه به دوران رسیده' (someone who recently became important/rich but acts like they have been that way for a long time)

Question

I explain this word by an example:

a person who recently became someone important or rich but, he behaves very pretentiously such a way that one might think he was rich or important for many years. For example, a beggar who finds a million dollars on the street by chance and next day, he starts to sneer at the indigent.

In Persian language we call it "تازه به دوران رسیده".

Is there equivalent for this word in English?

Answer 1

Although I think you did not provide a very suitable example, I answer this question as a learner. As I explained in the comment, in Persian, we use "ندید بدید" or "تازه به دوران رسیده" to describe a person who recently became someone important or rich but, he behaves very pretentiously such a way that one might think he was rich or important for many years. For example, a beggar who finds a million dollars on the street by chance and next day, he starts to sneer at the indigent.

I recommend you to provide more detailed and specific context so that the native can answer the question perfectly. With this regard, In order to provide some insights to your question, I can suggest:

parvenu:[noun] a person from usually a low social position who has recently or suddenly become wealthy, powerful, or successful but who is not accepted by other wealthy, powerful, and successful people

nouveau riche:[noun] a person who has recently become rich and who likes to spend a lot of money

upstart:[noun] a person who has recently begun an activity, become successful, etc., and who does not show proper respect for older and more experienced people

Answer 2

In many languages, there is either a word or a phrase to describe this adjective.

Below translation is what you are looking for, which is the best usage of the definition I can find.

nouveau-riche: A pejorative term for one who has recently become rich and who spends money conspicuously. From French, meaning "new rich."

However, if you are looking for an English slang to use in an urban way, there is this one:

chinless wonder:

• a silly man, typically of high social class
• Very derogatory term for an upper-class Brit, frequently one who gained his position via nepotism or other social connections, not through his own competence. The trademark recessive chin is thought to be due to inbreeding.
• A member of the upper classes - usually male.
• an English man from a high social class, who thinks he is intelligent and important, but who other people think is weak and stupid

It is usually used for a specific human profile who is rich, egocentric and simply idiot (other people see this person as so).

Answer 3

What about arriviste? "One that is a new and uncertain arrival (as in social position or artistic endeavor)"

You can see examples following the link. This one may fit your request

The town's old money immediately shunned these vulgar arrivistes, who may have had the cash but certainly not the class

As you can see it may imply negative connotations.