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.

this part isn't that TECHNICAL,
you actually could.
The Big Bang Theory Season 9, Episode 19

Well, it's just all very TECHNICAL
and boring.
Breaking Bad Season 3, Episode 8

Um, it's fairly TECHNICAL.
The Big Bang Theory Season 4, Episode 21

I've got another
TECHNICAL term for you.
Breaking Bad Season 2, Episode 5

-due to a TECHNICAL problem. Understood?
-Yes.
Money Heist Season 1, Episode 1