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.

That's not RIDICULOUS. Good night.
The Big Bang Theory Season 6, Episode 22

This is RIDICULOUS.
I'm coming to talk to you.
The Big Bang Theory Season 4, Episode 2

It's RIDICULOUS.
Westworld Season 2, Episode 3

You're being RIDICULOUS.
The Big Bang Theory Season 7, Episode 2

It's RIDICULOUS that we still have to
walk up all these flights of stairs.
The Big Bang Theory Season 6, Episode 19