The word "肮脏" is formed by combining two characters, each containing the radical 月 (representing flesh or the body), which semantically ties the term to physical impurity. The character 肮 uses 亢 primarily for its phonetic value to suggest the sound "āng", while 脏 uses 庄 primarily for its phonetic value to suggest "zāng". Together, these characters create a disyllabic word where both elements reinforce the meaning of "dirty" through their shared radical and phonetic components.