arduous

• Her tasks were arduous, her sympathies were drawn upon to the utmost, her responsibilities were great One who knew her well, and often saw her within the walls of the "Cooper Shop," thus gives us some incidents of her work there. —  Woman's Work in the Civil War A Record of Heroism, Patriotism, and Patience
• He had up to this time been serving with General Grant but was now to assume command of an enormous force and to engage in one of the most arduous, heroic, and successful campaigns in the military history of the country. —  Twenty Years of Congress, Vol. 1 (of 2) From Lincoln to Garfield, with a Review of the Events Which Led to the Political Revolution of 1860
• It seems to me that to achieve triumph in a career so arduous, the artist's own bent to the course must be inborn, decided resistless. —  Charlotte Brontë and Her Circle
• The greatest was the keeping of the North together in an enterprise so arduous, and an enterprise for objects so confusedly related as the Union and freedom. —  Abraham Lincoln
• His friends endeavoured to dissuade him from a career whose preparation was so long and arduous, and reminded him of the public offices he could have for the asking. —  The Conqueror

Roget's II: The New Thesaurus

Allen's Synonyms and Antonyms

Used in the Same Context