阴柔 describes a personality or aesthetic that is gentle, soft, and reserved — often associated with the 'yin' (阴) principle of softness, receptivity, and inwardness in Chinese philosophy. It contrasts with 阳刚 (yánggāng, 'masculine and strong'). You can use it for people (especially men with a gentle demeanor), voices, or artistic styles. Be careful: in some contexts it carries a subtle implication of effeminacy or lack of assertiveness, so tone matters.