effortful,"['arduous', 'backbreaking', 'difficult', 'dragging', 'exhausting', 'gruelling', 'hard', 'heavy', 'laborious', 'labourintensive', 'laboured', 'leaden', 'plodding', 'punishing', 'sisyphean', 'straining', 'strenuous', 'tiring', 'toilsome', 'wearing', 'wearying']"