The word 完善 is a compound formed by combining two semantically related characters: 完 (wán), meaning "complete" or "whole", and 善 (shàn), meaning "good", "perfect", or "virtuous". Together, they create a synergistic meaning where 完 provides the sense of bringing something to a state of thoroughness or finality, and 善 adds the qualitative dimension of excellence or goodness. As a result, the verb 完善 means "to perfect", "to refine", or "to improve (to make complete and good)", while as an adjective it describes something as "perfect" or "well-developed". This formation follows a common pattern in Chinese where two characters with complementary meanings merge to express a more complex and nuanced concept.