The phrase "arduous work" means tasks or activities that are difficult, challenging, and require a lot of effort and determination to complete. Full definition
Facing this reality brings us back to the long and arduous work of cultural change — including the political realm, but without neglecting the academy, entertainment, religion, and the arts. (firstthings.com)
These are driven people, doing arduous work in search of buried treasure; small wonder that things sometimes turn piratical. (discovermagazine.com)
Greater Maun is a vast area, where thousands of donkeys are used for arduous work like ploughing and pulling heavy carts. (spana.org)