The antonyms for the word "discarded" are essential and valuable. Essential items are considered necessary or important and cannot be done without, while valuable items have a high worth, importance, and utility. The complete opposite of "discarded" would be "kept" or "saved," which indicates that something has been preserved or held onto, rather than thrown away. Other antonyms for discarded include maintained, restored, and preserved. Therefore, if something is maintained, restored, preserved, it is either in perfect working condition or has been improved to a good state to carry out its function.