Fully developed is a phrase used to describe something that has reached its full potential or completed its growth process. There are several synonyms for this phrase, such as mature, grown, ripe, advanced, complete, and evolved. Mature is used to describe something that has reached its full development, and grown is used to describe something that has gone through a growth process resulting in completion. Ripe is used to indicate something that has reached its full potential, and advanced is used to describe something that has progressed to a higher level. Complete is used to suggest that something has been finished or done entirely, and evolved indicates that something has undergone a gradual development process.