The antonyms for the phrase "puts good use" would be "wastes," "misuses," or "squanders." When we say someone "puts good use" to something, it means that they use it effectively or in a productive way. However, if they were to waste it, misuse it, or squander it, it would mean that they are not utilizing it to its fullest potential. For example, if someone is given a scholarship but decides to drop out of school and not use the funds for their education, they would be wasting the opportunity and not putting it to good use. Therefore, it is important to make sure that we use our resources wisely and in a way that benefits us and others around us.