The Chinese word **密友 (mìyǒu)**, meaning "close friend" or "confidant," is a compound word formed by combining two characters: **密 (mì)**, which carries meanings of "close," "intimate," "dense," or "secret," and **友 (yǒu)**, which means "friend." It follows a common modifier-head structure in Chinese word formation, where the first character **密** acts as an adjective modifying the second character **友**, the noun. Thus, the literal construction is "close friend" or "intimate friend," where **密** intensifies the degree of friendship to imply a relationship characterized by trust, confidentiality, and deep familiarity.