French words that sound better in English (1) Yes, there are a bunch of them.

Frénésie

/fʁenezi/
frrray-nay-zee

Frenzy. The English word actually comes from the French one. And the French one comes from ancient Greek, where it used to mean an 'inflammation of the mind'. In ancient French and in medicine it was sometimes spelled phrénésie.
So... frenzy is the same word as frénésie, you might say. You would be right. But it'so much more efficient !  I like the acceleration of frenzy better, it's more, well... it's more frantic. 
(and not frénétique frray-nay-tee-k : by the time you finish to even pronounce that, any frénésie would be well ahead of you)
 
That is the sad truth, French can be clumsy sometimes. Apparently we are not very good at being intense.




PS : someone must have been aware of that before I was, back in 1988, because Roman Polanski's title was not translated for is movie Frantic. (young, handsome Harrison Ford, in gloomy 80's right bank Paris)
Of course, it was pronounced à la française...

'Do you remember the movie Frantic ? It's amazing how the city has changed..."

Emphasis and enthousiasm (2)

Trop

/tʁo/ 
Trrow. With the rough french rr from the back of the throat. (Make sure you keep it dry, you don't want to sound disgusting)

Too much. Too many.
Slightly more intense and young than vachement. Emphasize the rr :tRRop 
'C'est trop bon.' It's so good.
Use with a verb :'I am trrop into Michel Houellbecq's movie art.'


  

Grave

 /ɡʁav/
Grr-ah-vuh. With a long a 'You say tomayto and I say tomahto', the second one.

It means stern, weighty, serious. Nothing to do with a sepulture. Definitely modern. Works with anything. Easily used alone, with an emphasis on the a. Grraaave, like a hearty 'totally', with a little head nod.
'Are you hungry ? Grave.'
This one is so short and efficient it could be american english ! It does carry something post teenage-ish that you need to take into account (don't you have the feeling that this hungry person is about to indulge in some unhealthy fast food junk ?). It is also grammatically incorrect of course as it is an adjective that tends to be used as an adverb.
Not for use in a grown-up/serious/in-laws/professional context.

Enthusiasm and emphasis (1)

La vache !

/la vaʃ/
Lah vasch

The cow ! is an interjection to express how impressed or how surprised you are. Don't ask me why. I have no clue.
 'Oh, la vache ! It's raining hard !'

 

Vachement

 /vaʃmɑ̃/

Vah-schuh-mah

Cow-ly ? The adverb made from cow. It means ' a lot'. It belongs to that nice homy slang you would let your child use in front of you, but not in a writen essay. To be used everywhere, in any situation from 'a vachement cold afternoon' to a 'vachement nice-looking neighbor', or even on its own.

'Did you like it ? Vachement.'