arduous
WordReference English Thesaurus © 2025
Sense: Adjective: requiring exertion
Synonyms:
difficult Collocations, challenging Collocations, demanding Collocations, grueling, gruelling , hard Collocations, tough Collocations, rigorous, severe Collocations, strenuous, laborious, trying Collocations, exhausting, herculean, taxing, rough Collocations, tiring Collocations, backbreaking, punishing, exacting, fatiguing, hard going , brutal, formidable, toilsome