Synonyms of gruelling in English:

gruelling


See UK English definition of gruelling

adjective

1‘he undertook a gruelling three-mile run’

SYNONYMS
exhausting, tiring, fatiguing, wearying, enervating, taxing, draining, sapping, debilitating
demanding, exacting, trying, difficult, hard, arduous, laborious, back-breaking, strenuous, harsh, severe, stiff, punishing, crushing, crippling, grinding, brutal, relentless, unsparing
informal killing, murderous, hellish
British informal knackering
rare exigent