The antonyms for the word "wast at" are "used well". This means that when something is used well, it is not being wasted and is being utilized to its fullest potential. Examples of this could include using resources efficiently, using time wisely, or making the most of an opportunity. Alternatively, when something is "wast at", it is being squandered or not being used in the best possible way. It is important to remember that using resources, time, and opportunities well can lead to better outcomes and contribute positively to personal and societal development.