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.

We are ENTIRELY capable of waging war
against each other
Game of Thrones Season 7, Episode 7

but you appear to be
redefining those terms ENTIRELY.
Game of Thrones Season 7, Episode 4

I think you're focusing
ENTIRELY too much on the drugs.
The Big Bang Theory Season 1, Episode 15

who's made ENTIRELY of...
The Big Bang Theory Season 7, Episode 3

I'm disappointed, Maeve,
but not ENTIRELY surprised.
Westworld Season 3, Episode 8