"Well-spent" is a term used to describe something that has been used or invested wisely, resulting in a positive outcome. Some synonyms for this term include "worthwhile," "productive," "advantageous," "fruitful," "profitable," "successful," "beneficial," "useful," and "rewarding." These words all describe a situation where an investment of time, effort, or money has been put to good use, leading to a beneficial outcome. Using these synonyms in context can help to avoid repetition in writing, and can convey a more comprehensive understanding of the situation being described. Overall, these words help to paint a picture of a situation that is beneficial and positive.