異 性(いせい)

いせい

noun

the opposite sex

See also: 威勢(いせい) (vigor, energy)

1. the opposite sex

A person or people of the opposite sex. Used when discussing attraction, relationships, and social interactions between men and women.

異性(いせい)の友人(ゆうじん)はいますか。

Do you have friends of the opposite sex?

彼(かれ)は異性(いせい)にとても人気(にんき)がある。

He is very popular with the opposite sex.

異性(いせい)との付(つ)き合(あ)いに慣(な)れていないので、緊張(きんちょう)してうまく話(はな)せなかった。

I wasn't used to interacting with the opposite sex, so I was nervous and couldn't speak well.

Usage

異性(いせい) is a neutral, standard term for the opposite sex. It is commonly used in discussions about relationships, attraction, and social dynamics. The antonym is 同性(どうせい) (same sex).

Common collocations

異性(いせい)に好(す)かれる (be liked by the opposite sex)
異性(いせい)の友人(ゆうじん) (friend of the opposite sex)
異性(いせい)との交際(こうさい) (dating someone of the opposite sex)
異性(いせい)を意識(いしき)する (become aware of the opposite sex)

Similar words

同性(どうせい): the same sex (antonym)
男女(だんじょ): men and women (refers to both sexes together)
異性愛(いせいあい): heterosexuality (sexual orientation)

Related Words

Antonym: 同性(どうせい) (the same sex)

Compare: 威勢(いせい) (vigor (homophone))

Compare: 男女(だんじょ) (men and women)

general

Added 2026.2.25 23:31 · Revised 2026.9.2 13:01

13500/13568_isei