na-adjective
boyish; tomboyish
Describes a girl or woman whose appearance, fashion, or manner is boyish or tomboyish. Often used positively for a cute, androgynous style.
彼女はショートカットでボーイッシュな雰囲気だ。
With her short haircut, she has a boyish vibe.
ボーイッシュなファッションが好きな女の子も多
Many girls like boyish fashion.