arduous

/ˈɑːdjuːəs/

/ˈɑɹdʒuəs/

arduous

requiring so much effort, mostly physical, that will cause exhaustion

requiring vigorous effort, particularly on a continuous basis

taxing to the utmost; testing powers of endurance

synonyms : straining

Examples

1. For the arduous trek before them, she knew they required the sturdy guidance of one who had walked many paths.

2. The rehab process was arduous.

3. The journey was arduous.

4. The process is undoubtedly arduous.