The word "un-demanding" refers to something that is not difficult or challenging. Its antonyms include demanding, challenging, difficult, exacting, arduous, grueling, onerous, and strenuous. When a task or job is demanding, it requires the person to put in a lot of effort and energy. A challenging task is something that requires a person to use their problem-solving skills and push themselves to their limits. Difficult tasks are those that are hard to accomplish and may require specialized skills or knowledge. Exact tasks require precision and accuracy. Arduous, grueling, onerous, and strenuous tasks are physically taxing and require a lot of endurance.