Also means
hardworking
Usage Note
Laborieux has two distinct registers: applied to a task, it means tedious and requiring great effort; applied to a person, it means diligent and hardworking (now somewhat dated). The feminine is laborieuse. Les classes laborieuses historically referred to the working classes.
Examples
"La rédaction de ce rapport est laborieuse."
Natural Translation
Writing this report is laborious.

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