Synonyms and related words :
Augean task, Herculean task, arduousness, backbreaker, backbreaking work, ballbuster, bitch, burdensomeness, chore, dead lift, effortfulness, handful, hard labor, hard pull, hard work, heavy sledding, laboriousness, large order, man-sized job, onerousness, oppressiveness, rough go, strenuousness, tall order, toilsomeness, tough job, tough proposition, troublesomeness, uphill work, warm work