Synonyms of punishing in English:

punishing


See US English definition of punishing

See UK English definition of punishing

See Spanish definition of duro

adjective

1‘she went on a punishing schedule of visits to the US’

SYNONYMS
arduous, demanding, taxing, onerous, burdensome, strenuous, rigorous, stressful, trying, severe, cruel, stiff, heavy, hard, difficult, uphill, tough, exhausting, fatiguing, wearying, enervating, debilitating, prostrating, sapping, wearing, draining, tiring, gruelling, grinding, back-breaking, crippling, relentless, unsparing, inexorable
informal killing, murderous
ANTONYMS

easy, effortless