Synonym: backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, straining, strenuous, toilsome. Similar words: assiduous, tenuous, virtuous, sumptuous, ambiguous, ingenuous, superfluous, innocuous. Meaning: ['ɑːdjʊəs] 
adj. 1. characterized by toilsome effort to the point of exhaustion; especially physical effort 2. taxing to the utmost; testing powers of endurance 3. difficult to accomplish; demanding considerable mental effort and skill.
adj. 1. characterized by toilsome effort to the point of exhaustion; especially physical effort 2. taxing to the utmost; testing powers of endurance 3. difficult to accomplish; demanding considerable mental effort and skill. 
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121) The arduous workload and difficulty manifests in the establishment of huge database , and the parametric drawing of dozens of kinds of parts and components and 30 transmission plan.
122) With determination, our leaders mobilized the whole nation to fight an arduous and soul-stirring battle against the disease, winning a significant victory at last.
123) Researching and writing a clear and well-arranged paper is an arduous task, particularly if you are not writing in your mother tongue.
124) After tireless efforts and arduous exploration, researchers finally identified the virus's natural reservoir, it is likely to be living in Africa,[www.Sentencedict.com] African green monkeys or monkey.
125) They crystallize collective and arduous wisdom and labor, through fair - spoken turn oneself into working outstanding achievement.
126) Thus the transformation of a guerrilla zone into a base area is an arduous creative process, and its accomplishment depends on the extent to which the enemy is destroyed and the masses are aroused.
127) It is an inescapable duty as well as an arduous task for Agricultural Development Banks to lend support to leading grain enterprises in the industrialization of agriculture.
128) The goal that achieves agricultural modernization has sex and arduous sex.
129) One would make arduous efforts when he has a dream.
130) The western painting has experienced essential changes as a result of the arduous exploration of Monet, Seurat, Cezanne, Van Gogh, Gauguin.
131) It remains an arduous historical task in the process of our modernization drive to accomplish industrialization.
132) Her delicate constitution disincline her from such an arduous job.
More similar words: assiduous, tenuous, virtuous, sumptuous, ambiguous, ingenuous, superfluous, innocuous, voluptuous, continuous, incongruous, promiscuous, conspicuous, tempestuous, disingenuous, presumptuous, hazardous, duotone, duodenum, hard, card, yard, award, beard, board, guard, heard, pardon, aboard, ardent.