grueling Synonyms

heavy laborious toilsome hard punishing backbreaking gruelling operose arduous sisyphean stiff strenuous back-breaking severe rigorous punitory plumbic penological painful stressful taxing tedious unlivable torturesome wrenching woeful wearying wearisome wearing uphill trying troublesome tough tiring testing onerous murderous macer fatiguing exhausting exacting enervating draining difficult demanding debilitating cruel clayey challenging burdensome