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.

Brought shame on the Citadel
with his REPUGNANT experiments.
Game of Thrones Season 4, Episode 2

More REPUGNANT than
your gnarled fingers on that girl's thighs?
Game of Thrones Season 4, Episode 2