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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