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.

The same lecture, really,
just with tiny, TEDIOUS variations.
Game of Thrones Season 3, Episode 4

has gotten
a little TEDIOUS lately.
The Big Bang Theory Season 7, Episode 5

commitment to attend her
aunt's TEDIOUS birthday party.
The Big Bang Theory Season 5, Episode 19

TEDIOUS research,
sleepless nights filled with indecision.
The Big Bang Theory Season 9, Episode 19

A great doughy lump I'd sat next to
at endless dinners and TEDIOUS gatherings.
Game of Thrones Season 4, Episode 3