Adjective: arduous aa(r)-joo-us or aa(r)-dyoo-us
- Difficult to accomplish; demanding considerable mental effort and skill
"the arduous work of preparing a dictionary"
- Characterized by effort to the point of exhaustion; especially physical effort
"worked their arduous way up the mining valley";
- backbreaking, grueling [US], gruelling [Brit, Cdn], hard, heavy, laborious, operose, punishing, toilsome, killing [informal]
- Taxing to the utmost; testing powers of endurance
"your willingness after these six arduous days to remain here";
- straining, strenuous
See also: difficult, effortful, hard
Encyclopedia: Arduous