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say it: AHR-joo-uhs
arduous is an adjective meaning "characterized by effort to the point of exhaustion; especially physical effort". It is pronounced /ˈɑɹdʒuəs/ — AHR-joo-uhs. It carries 3 recorded senses.
characterized by effort to the point of exhaustion; especially physical effort
“worked their arduous way up the mining valley”
“a grueling campaign”
“hard labor”
“heavy work”
“heavy going”
“spent many laborious hours on the project”
“set a punishing pace”
difficult to accomplish; demanding considerable mental effort and skill
“the arduous work of preparing a dictionary”
Definitions, synonyms and semantic relations for arduous come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.