noun
nature; disposition; temperament; character
Refers to a person's inherent personality, temperament, or disposition. Often used in descriptions of someone's basic nature.
彼は穏やかな性質だ。
He has a gentle nature.
性
It's hard to work with someone whose temperament doesn't match yours.
noun
quality; property; characteristic; nature
Refers to the inherent characteristics or properties of a thing, substance, or concept. Can be used in scientific contexts (e.g., chemical behavior).
この物質の性質を調べる。
We investigate the properties of this substance.
問題の性質をよく理解する必要がある。
We need to understand the nature of the problem well.