The Collaborative International Dictionary
exhausting tiring wearing wearying
effortful \effortful\ adj. 1. requiring great physical effort. Opposite of effortless. [Narrower terms: arduous, backbreaking, back-breaking, grueling, gruelling, hard, heavy, laborious, labourious, punishing, slavish, strenuous, toilsome; exhausting, tiring, wearing, wearying] Also See: difficult, hard.