The word 心烦意乱 is formed by combining two parallel two-character phrases: 心烦, meaning "heart troubled" or "mind annoyed", and 意乱, meaning "thoughts disordered" or "mind confused". The characters 心 (heart/mind) and 意 (thoughts/mind) are semantically related, as are 烦 (annoyed) and 乱 (disordered), creating a compound that emphasizes a state of emotional agitation and mental chaos through this symmetrical structure.