異性 いせい the opposite sex N1 #8,691 Meanings noun, takes の the opposite sex chemistry isomerism Its kanji 異 イ · こと、こと.なる、け uncommon, different, queerness, strangeness, wonderful, curious, unusual 性 セイ、ショウ · さが sex, gender, nature In sentences Furigana あいつ、異性いせいの友達ともだち多おおいよな。 He has a lot female friends. #11550208