What is the best synonym for arduous

Burdensome is the best synonym for arduous.Synonyms toilsome effortful gruelling hard laborious operose grueling backbreaking heavy featured games sea scrambler the ultimate crossword game rhymes with arduous ambiguous conspicuous contemptuous contiguous continuous deciduousExtremely arduous, exhausting, or demoralizing backbreaking labor backbreaking rentsSee answer (1) best answer.Characterized by effort to the point of exhaustion;Arduous's synonyms are：backbreaking, grueling, gruelling, har., what's the synonyms of arduous 's definition：difficult to accomplish;

Edited by jeifunk [7/6/2016 9:25:34 am] s.Antonym.com is the web's best resource for english synonyms, antonyms, and definitions.Laborious difficult, property strenuous difficult, hard heavy difficult, oppressive hard difficult, property difficult hard, property tough difficult, demanding toilsome burdensome heavy, oppressive onerous heavy, oppressive formidable demanding, heavy uphill onerous, easy grueling exhausting