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.

Here? It’s a bit SEEDY, right?
Money Heist Season 1, Episode 1

A SEEDY bar
on the wrong side of the tracks...
The Big Bang Theory Season 6, Episode 18

...shall we say, the SEEDY underbelly
of the collectibles world.
The Big Bang Theory Season 3, Episode 17

Seedy underbelly?
The Big Bang Theory Season 3, Episode 17