Synonyms of arduous in English:

arduous


See definition of arduous

adjective

1‘she was now faced with an arduous journey into a remote country’

SYNONYMS

onerous, taxing, difficult, hard, heavy, laborious, burdensome, strenuous, vigorous, back-breaking, stiff, uphill, relentless, Herculean

demanding, trying, tough, challenging, formidable, exacting

exhausting, wearying, fatiguing, tiring, punishing, gruelling, grinding

intolerable, unbearable, murderous, harrowing

informal killing, no picnic

British informal knackering

archaic toilsome

rare exigent

ANTONYMS

easy, effortless