What languages are perceived as classy or fancy to French speakers?

Question

In English, this might be demonstrated by using the word *boutique* rather than *shop*, or by saying *au contraire* rather than *on the contrary*, because to English speakers French is commonly perceived as high-class or fancy (at least in American/British English) and sometimes that's the feel the speaker is going for.If French speakers were to substitute in a foreign word for no reason other than that it could be perceived as more classy or prestigious, which language or languages would it tend to come from?---If, after Aerovistae's able editing of the original question as above, the sense of the question is still unclear, I want to emphasize the fact that words like 'boutique' or 'au contraire' have a unique status in English in that they - sound distinctly foreign and - replace more ordinary words of the same meaning.There are words to sound more learned or pedantic without sounding foreign, e.g. 'lachrymose' for 'tearful.' Others don't have a more ordinary alternative, e.g. 'gestalt' in 'gestalt psychology' or 'allegro' and 'andante.'These 'fancy foreign sounding' words in English are predominantly from French. It's very possible that French does not have an equivalent, and that would be an answer.In other words: Whatever may be the shortcomings of this question, it is not vague.

Answer 1

I don't really think French has a perfect equivalent to what you are describing.

In my opinion, the only foreign language that might sound fancy (but might also be perceived as pedantic sometimes) to French speakers is Latin.

For example, when English speakers use "au contraire" instead of "on the contrary", French speakers might use "a contrario", which sounds fancier.

Other examples are:

1. "une condition sine qua none" to mean "une condition indispensable" (something absolutely necessary).
2. "ad vitam aeternam" instead of "pour toujours" (forever)
3. un "casus belli" to mean a reason for conflict

Other foreign languages can also sound fancy but are only used for specific domain (German for phliosophy, Italian for food, music and lifestyle)...