arduous
adjectivemasculineformal/ɐɾˈduu/medium
ar·du·o
Definition
Involving or requiring strenuous effort; difficult and tiring.
The arduous journey through the mountains took several days.
She began the arduous process of learning a new language.
Common collocations
arduous taskarduous journeyarduous workarduous process
Etymology
Do latim 'arduus, -a, -um' (alto, íngreme, difícil).