na-adjective
Used as a na-adjective to describe a person, attitude, or thing as mature, often with a slightly sophisticated or adult nuance. Less common than native equivalents like 成熟した.
彼はとてもマチュアな考え方を持っている。
He has a very mature way of thinking.
このワインはマチュアな味わいだ。
This wine has a mature flavor.