形容词

1. 耗时费力的；辛苦的；艰难的
If you describe a task or job as laborious, you mean that it takes a lot of time and effort.

1. characterized by effort to the point of exhaustion
especially physical effort

e.g. worked their arduous way up the mining valley
a grueling campaign
hard labor
heavy work
heavy going
spent many laborious hours on the project
set a punishing pace

Synonym: arduousbackbreakinggruelinggruellinghardheavyoperosepunishingtoilsome