young woman; adult woman
Colloquial term often used in lifestyle media and marketing to refer to women in their 20s to 30s who are mature yet youthful, with a focus on fashion, beauty, and lifestyle.
A café popular with young adult women has opened.
This magazine introduces fashion for young adult women.
女子 is a general term for girls or young women, while オトナ女子 specifically emphasizes adult, mature femininity with a trendy nuance.
大人の女性 is a more formal and neutral way to say 'adult woman', without the trendy, media-driven connotation of オトナ女子.
Common katakana spelling for this colloquial term.
Kanji spelling is also used, but katakana is more typical in media and marketing.
A modern compound of オトナ (adult) and 女子 (girl/woman), popularized in Japanese lifestyle media and marketing from the 2010s onward.