The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

I'm RELAXED.
I'm RELAXED. I'm rela...
Breaking Bad Season 2, Episode 1

Sophisticated and RELAXED?
Friendly, noncommittal?
The Big Bang Theory Season 4, Episode 4

Hey, Amy. Relaxed?
The Big Bang Theory Season 12, Episode 19

You see how RELAXED she is?
Money Heist Season 1, Episode 8

Then, we RELAXED."
Money Heist Season 1, Episode 11