one's nature; inherent character; destiny
Refers to a person's innate disposition, temperament, or the fate that seems to come from that nature. Often used in expressions like 性だから (it's just my nature) or 性には逆らえない (you can't fight your nature).
I can't fix my laziness; it's just my nature, so there's no help for it.
custom; tradition; habit; convention
Used for long-standing customs, traditions, or deeply ingrained habits of a group or society. Often carries a nuance of something that has become second nature through repetition.
彼の性には逆らえなかった。
He couldn't go against his own nature.
In this village, it's a custom for everyone to prepare for the festival together.
Out of long habit, I always read the newspaper in the morning.
Standard kanji spelling for inherent nature, destiny, or ingrained habit.
Rare alternative kanji; 性 is overwhelmingly more common.
The reading さが is native Japanese, and the kanji 性 is conventionally associated with the meaning of 'nature' or 'disposition'. The exact historical derivation is uncertain.