The suffix 性 can turn some adjectives or verbs into abstract nouns ending with “ity, ness, etc” e.g.
Meanings of 性 xìng
Noun
①（性格）nature
性善 be good-natured, 人性, 兽性, 野性
②（特性）character
→ 性格, 秉性, 耐性
③（性质）nature
性能, 词性, 惯性
④（性别）sex
男性, 女性, 雄性
⑤（与性相关）sexual intercourse
性侵犯 sexual assault, 性变态 sexual perversion, 性病, 性感
⑥［语言］gender
阳性, 阴性, 中性
Formula of the suffix 性
adjectives +性 = abstract nouns ending with “ity, ness, etc” e.g.
Examples：
雄 male + 性 = 雄性 maleness
必要 necessary + 性 = 必要性 necessity
正确 correct + 性 = 正确性 correctness
灵活 flexible + 性 = 灵活性 flexibility
连贯 continuous + 性 = 连贯性 continuity
可能 possible + 性 = 可能性 possibility
复杂 complex + 性 = 复杂性 complexity
主观 subjective + 性 = 主观性 subjectivity
客观 objective + 性 = 客观性 objectiveness
流动 mobile + 性 = 流动性 mobility
创造 create + 性 = 创造性 creativity
特殊 peculiar + 性 = 特殊性 peculiarity
可行 feasible + 性 = 可行性 feasibility
The suffix 性 can also turn some nouns into adjectives
Examples:
教育 education + 性 = 教育性 educational
季节 season + 性 = 季节性 seasonal
The suffix 性 can also turn some verbs into into nouns.
Example:
创造 create + 性 = 创造性 creativity
See also the suffix 度, which can turn adjectives into nouns.