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.

...because of your initial
and inadequate DECEIT.
The Big Bang Theory Season 1, Episode 10

No, no, of course not.
No, see, I used trickery and DECEIT.
The Big Bang Theory Season 2, Episode 3

starting with the confusion,
the DECEIT, why we couldn't
tell anyone--
Breaking Bad Season 4, Episode 4

choking on violence, corruption, and DECEIT.
Game of Thrones Season 5, Episode 10

Which war was won
without DECEIT and mass murder?
Game of Thrones Season 7, Episode 6