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.

Do you know when he will have
his ULTIMATE moment of lucidity?
Money Heist Season 3, Episode 4

Amazing Spider-Man, Ultimate Spider-Man,
Spectacular Spider-Man...
The Big Bang Theory Season 2, Episode 20

...why everything exists
and what its ULTIMATE end will be.
The Big Bang Theory Season 6, Episode 24

...of arm wrestling with the mental agility
of Tetris into the ULTIMATE sport.
The Big Bang Theory Season 1, Episode 16

"is entitled
to the ULTIMATE train experience
The Big Bang Theory Season 10, Episode 15