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.

Friends overlook each other's
MINOR lapses.
The Big Bang Theory Season 4, Episode 6

Just some MINOR offence.
Breaking Bad Season 3, Episode 12

Maybe it's just something MINOR.
The Big Bang Theory Season 7, Episode 17

This is just a MINOR setback.
The Big Bang Theory Season 7, Episode 13

...my career trajectory
has taken a MINOR detour.
The Big Bang Theory Season 3, Episode 1