grueling Synonyms

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