Serene means extremely content or peaceful.
'content' is the French word for satisfied, happy
Black soil has the maximum content and is extremely fertile.
Extremely worn and in poor condition.
A town that is extremely bustling and busy.
Something extremely nauseous and terrible.
merutseh (מרוצה) = content or satisfied.
extremely beautiful; entrancingit means astonishing
Extremely or excessively cautious. A common fault these days.
The French adjective "content" (fem. "contente") means "happy" or "satisfied", just like in English.
It is possible that you are thinking of the word noxious, meaning extremely bad or toxic.
yes it is extremely rude, never say it.
Nippy means Extremely Cold but is sometimes used to replace the word "Super Fast".