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.

IDIOTIC-- Stupid idiot, I could've--
Breaking Bad Season 5, Episode 12

Yeah, there's a point
when this becomes IDIOTIC.
The Big Bang Theory Season 3, Episode 17

I didn't mean
to call it IDIOTIC.
The Big Bang Theory Season 7, Episode 12

Well, I don't think
you called it IDIOTIC.
The Big Bang Theory Season 7, Episode 12

I'm not talking to you like an idiot.
I'm saying the whole idea is IDIOTIC.
The Big Bang Theory Season 3, Episode 7