na-adjective
expressive; full of expression
Describes a person, face, performance, or work that conveys emotion vividly. Often used for facial expressions, acting, or artistic delivery.
彼女の表情豊かな演技に感動した。
I was moved by her expressive performance.
この絵はとても表情豊かだ。
This painting is very expressive.
Compound of 表情 (facial expression) and 豊か (abundant, rich). The exact historical derivation is uncertain, but the meaning is transparent from its components.