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.

Their world is not
for the FAINT of heart,
Bernard.
Westworld Season 2, Episode 10

Faint praise, my lord.
Game of Thrones Season 3, Episode 7

but I did not FAINT. Okay?
Breaking Bad Season 5, Episode 12

If I FAINT, pull me out.
Game of Thrones Season 3, Episode 5