also: あだるてぃー
na-adjective
Wasei-eigo slang derived from English 'adulty'. Describes a person, behavior, or atmosphere that is sophisticated, mature, or adult-like, often with a stylish or refined connotation. Used casually, especially in fashion, lifestyle, and media contexts.
wasei-eigo (Japanese-coined English), from adulty
彼女のファッションはいつもアダルティでかっこいい。
Her fashion is always mature and cool.
このバーはアダルティな雰囲気がいいね。
This bar has a nice grown-up atmosphere.
na-adjective
Slang extension of the 'adult' sense, implying sexual attractiveness or erotic appeal. Often used to describe a person's allure, clothing, or a suggestive mood. Less common than the mature/sophisticated sense.
あの俳優のアダルティな魅力にみんな夢中だ。
Everyone is captivated by that actor's sexy charm.