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.

Penny, this is your enterprise,
so it's ULTIMATELY your decision.
The Big Bang Theory Season 2, Episode 18

Do you think this song is the music
the white boy ULTIMATELY plays?
The Big Bang Theory Season 8, Episode 19

...or it tracks back to axiomatic statements,
or it's ULTIMATELY circular...
The Big Bang Theory Season 2, Episode 1

Sweet and enjoyable at first, but
ULTIMATELY a flavorless lump of sadness.
The Big Bang Theory Season 9, Episode 8

that ULTIMATELY killed her.
The Big Bang Theory Season 5, Episode 16