na-adjective
androgynous; having both male and female characteristics
Describes a person, appearance, or quality that blends masculine and feminine traits. The glosses 'isosexual' and 'amphoteric' are technical terms from biology and chemistry respectively, and are not common in everyday use.
彼のファッションはとても両性的で、性別を感じさせない。
His fashion is very androgynous and doesn't give a sense of gender.
そのモデルは両性的な魅力を持っている。
That model has an androgynous charm.
Compound of 両性 (ryōsei, 'both sexes') + 的 (-teki, '-like, -ic'). The base 両性 is itself from 両 (ryō, 'both') + 性 (sei, 'sex, gender').