Most common:
* Ennuyeux/Ennuyeuse: This is the most common and general translation for "boring."
* "Le film était ennuyeux." (The movie was boring.)
* "Ce travail est ennuyeux." (This job is boring.)
Other options:
* Monotone: This implies something lacking in excitement or variety.
* "La musique était monotone." (The music was monotonous.)
* "Sa voix est monotone." (His voice is monotone.)
* Fatiguant/Fatigante: This translates to "tiring" or "exhausting" and can be used to describe something boring that makes you feel tired.
* "Ce cours était fatiguant." (This class was tiring.)
* Repetitive: This describes something that is repetitive and therefore boring.
* "Le travail est repetitive." (The work is repetitive.)
The best translation will depend on the specific context and the nuance you want to convey.