The word 亲密 is formed by combining two characters, each contributing a layer of meaning about closeness. The first character, 亲 (qīn), fundamentally represents familial intimacy and blood relation, evoking the innate bond between parent and child. The second, 密 (mì), originally depicts something dense, secret, or with no gaps, like a thick forest or a confidential matter. When joined, they create a powerful conceptual blend: the profound, heart-felt connection of family (亲) is fused with the idea of seamless, unwavering tightness and privacy (密), together picturing a relationship that is both emotionally deep and inseparably close.