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.

No, that's RIDICULOUS.
The Big Bang Theory Season 4, Episode 21

- I went to art school.
- Equally RIDICULOUS. Let's go.
The Big Bang Theory Season 6, Episode 2

Well, this is RIDICULOUS.
The Big Bang Theory Season 9, Episode 8

Sounds RIDICULOUS, doesn't it?
Game of Thrones Season 5, Episode 3

Did it look RIDICULOUS
when we got the Satanimals pack
The Big Bang Theory Season 5, Episode 10