Formal:
* Pas intéressant: This is the most literal translation and is appropriate for formal settings.
* Pas captivant: This translates to "not captivating" and emphasizes the lack of engagement.
* Sans intérêt: This means "without interest" and is a more concise way to express the same meaning.
Informal:
* Pas du tout intéressant: This means "not at all interesting" and adds a stronger emphasis.
* Pas top: This is a slang expression meaning "not great" or "not exciting."
* Bof: This is a very informal expression meaning "meh" or "so-so." It implies a lack of enthusiasm.
Other options:
* Ennuyeux: This means "boring" and is a more direct way to express that something is not interesting.
* Monotone: This translates to "monotonous" and describes something that is lacking in variety or excitement.
The best choice will depend on the specific situation and your desired level of formality.