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arduous
01
mühsam, anstrengend
requiring so much effort, mostly physical, that will cause exhaustion
Example
The climb up the mountain was an arduous task for the hikers.
Preparing for the marathon proved to be an arduous training routine.
02
beschwerlich, anstrengend
requiring a lot of mental effort and hard work
Example
Writing a novel can be an arduous process, requiring long hours of focused concentration and creativity.
Building a successful business from the ground up is an arduous endeavor that involves overcoming numerous obstacles and setbacks.
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