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
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Synonyms for backbreaking 
