1. (adj) arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome
characterized by effort to the point of exhaustion; especially physical effort
Synonyms: backbreaking, sullen, ponderous, laborious, overweight, toilsome, intemperate, sound, wakeless, dense, grueling, with child(p), threatening, grave, straining, severe, cloggy, lumbering, large(p), great(p), clayey, enceinte, voiceless, grievous, tough, fleshy, weighed down, hard, weighty, unvoiced, gruelling, expectant, concentrated, lowering, surd, heavy(a), sonorous, impenetrable, arduous, operose, strenuous, heavy, heavy(p), big(a), labored, profound, difficult, laboured, punishing, strong, gravid, big(p), leaden, knockout
Antonyms: effortless, easy
2. (adj) arduous, straining, strenuous
taxing to the utmost; testing powers of endurance
Synonyms: toilsome, heavy, strenuous, laborious, punishing, hard, operose, arduous, grueling, backbreaking, straining, gruelling
Antonyms: effortless, easy
3. (adj) arduous
difficult to accomplish; demanding considerable mental effort and skill
Synonyms: toilsome, heavy, strenuous, laborious, punishing, hard, operose, grueling, backbreaking, straining, gruelling
Antonyms: easy, effortless
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Synonyms and Antonyms of arduous 
