• 性せい

  nature (of a person)

• 性分しょうぶん

  nature, disposition

• 性行せいこう

  character and conduct

• 性欲せいよく

  sexual desire, sex drive, lust

• 性交せいこう

  sexual intercourse, sex, coitus

• 性別せいべつ

  (distinction of) sex, gender

• 性能せいのう

  ability, performance, efficiency

• 性向せいこう

  inclination, tendency, nature, character

• 性的せいてき

  sexual (i.e. relating to biological sex)

• 性病せいびょう

  sexually transmitted disease, STD, sexually transmitted infection, STI, venereal disease, VD

• 性急せいきゅう

  hasty, rash, rushed, hurried, impatient, impetuous, quick-tempered

• 性格せいかく

  character (of a person), personality, disposition, nature

• 性癖せいへき

  disposition, inclination, characteristic, idiosyncrasy, propensity

• 性質せいしつ

  nature (of a person), disposition, temperament, character

• 女性じょせい

  woman, female

• 中性ちゅうせい

  neutrality (incl. chemical, electrical, etc.), indifference

• 異性いせい

  the opposite sex

• 悪性あくせい

  malignant (cancer), virulent, pernicious (anemia, anaemia)

• 相性あいしょう

  affinity, compatibility, chemistry (between people)

• 耐性たいせい

  resistance (e.g. to antibiotics), tolerance (e.g. drug tolerance)

• 陰性いんせい

  negative (result)

• 男性だんせい

  man, male

• 慢性まんせい

  chronic (illness)

• 理性りせい

  reason, reasoning power, (one's) sense

• 母性ぼせい

  motherhood, maternity

• 根性こんじょう

  willpower, guts, determination, grit, spirit

• 本性ほんしょう

  true character, real nature

• 野性やせい

  wildness, wild nature, untamed nature, savage nature

• 惰性だせい

  force of habit

• 適性てきせい

  aptitude, aptness, suitability

• 毒性どくせい

  toxicity, virulence

• 気性きしょう

  disposition, temperament, temper, nature

• 同性どうせい

  same sex

• 品性ひんせい

  character

• 習性しゅうせい

  habit

• 感性かんせい

  sensitivity, sensitiveness, sense (of ...)

• 特性とくせい

  special characteristic, special quality, trait, idiosyncrasy, peculiarity

• 急性きゅうせい

  acute (illness)

• 活性かっせい

  activity

• 個性こせい

  individuality, personality, quirk, idiosyncrasy, character, individual characteristic

• 知性ちせい

  intelligence

• 天性てんせい

  nature, natural constitution, innate disposition

• 陽性ようせい

  positive (result)

• 酸性さんせい

  acidity

• 性教育せいきょういく

  sex education

• 性感帯せいかんたい

  erogenous zone

• 多様性たようせい

  diversity, variety

• 水溶性すいようせい

  water-soluble

• 生産性せいさんせい

  productivity

• 将来性しょうらいせい

  future prospects, promise