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arduous
01
requiring so much effort, mostly physical, that will cause exhaustion
02
taxing to the utmost; testing powers of endurance
03
requiring vigorous effort, particularly on a continuous basis
Example
The explorer's journey through the Amazon rainforest was epically arduous.
The military unit packed their ammunition and supplies on pack mules for the arduous journey through rugged terrain.
Training for elite-level athletics is an arduous commitment that requires strict discipline and sacrifice.
Completing a marathon is an arduous challenge that requires months of training and mental resilience.
Studying for a medical degree is an arduous journey that requires years of rigorous coursework and practical training.
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