adjective
arduous
AH-dyoo-uhs
adjective
1
Requiring great effort or endurance; difficult and tiring.
"The climb to the summit was long and arduous."
"Recovering from surgery proved to be an arduous process."
How to Use Arduous
Learner’s notesIn plain EnglishVery hard work that takes a lot of effort and stamina to get through.
Common pairings
arduous journey
arduous task
arduous climb
Word Forms
more arduous comparative, most arduous superlative
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Etymology
From Latin arduus, "steep, high, difficult," related to an old word for "high."