異性 いせい Meanings Noun, の-adjective the opposite sex See also: 同性 (どうせい). isomerism Kanji 異 different. Read as イ. 性 nature. Read as セイ. Example sentences あいつ、異性の友達多いよな。He has a lot female friends. 私の彼氏、異性の友達が多いのよね。My boyfriend has a lot of female friends. Words containing 異性 特異性 (とくいせい) singularity 異性体 (いせいたい) isomer 異性愛 (いせいあい) heterosexuality And 26 more. Word lists JLPT N1 Spoken Jinuma: Japanese Dictionary · Word lists