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.

Must have been HORRIBLE for you,
as a Kingsguard, as a father.
Game of Thrones Season 7, Episode 3

Lots of HORRIBLE shit in this world gets
done for something larger than ourselves.
Game of Thrones Season 6, Episode 8

That was a HORRIBLE place.
They made me feel like
I was crazy.
Westworld Season 2, Episode 9

ls that HORRIBLE for me to say?
Not at all.
Breaking Bad Season 4, Episode 3

It was HORRIBLE enough for me.
Game of Thrones Season 7, Episode 3