Formal:
* Gênant: This is a good choice for situations where you want to be polite but still express that something is annoying.
* Désagréable: This word means "unpleasant" and is a bit stronger than "gênant."
* Ennuyeux: This translates literally as "boring" but can also be used to describe something that is annoying.
Informal:
* Chiant: This is a very informal and colloquial word meaning "annoying" or "a pain in the neck." It is very common in everyday French but should be avoided in formal situations.
* Pénible: This word means "troublesome" or "tiresome."
* Embêtant: This is a more common and less strong word for "annoying."
Examples:
* "That noise is really annoying."
* "Ce bruit est vraiment gênant." (Formal)
* "Ce bruit est vraiment chiant." (Informal)
* "This weather is so annoying."
* "Ce temps est vraiment désagréable." (Formal)
* "Ce temps est vraiment pénible." (Informal)
Choosing the best translation depends on the context and the level of formality you want to use.