arduous
adjective C1
Plain meaning
very difficult and needing a lot of effort
Exam-register meaning
In academic or exam writing, this is used to discuss very difficult and needing a lot of effort in a more precise way.
In context
naturalThe report described arduous task in a clear and practical way.
examThe findings show that arduous task can influence educational, social, or economic outcomes.
Common collocations
arduous taskarduous journeyarduous process
Watch out
Do not overuse it as a direct replacement for “good/bad”. Use it with natural nouns such as “arduous task”.