Arduous

مترادف و متضاد arduous

1. adjective difficult, hard to endure
   Synonyms: backbreaking, burdensome, exhausting, fatiguing, formidable, grueling, harsh, heavy, labored, laborious, murder, no picnic, onerous, painful, punishing, rigorous, rough, severe, strenuous, taxing, tiring, toilsome, tough, troublesome, trying, uphill
   Antonyms: easy, facile, motivating