also: しょうらい
He is an optimist by nature.
I have not been physically strong by nature.
since birth; in one's entire life
Only when written 生来
Emphasizes a continuous state or experience from birth until now. Restricted to the 生来 kanji form.
I have never been abroad in my entire life.
Standard kanji form; high-frequency in news and written Japanese.
Rarely used kanji form.
Alternate reading; less common than せいらい. Included as a search variant.
Compound of 生 (life, birth) and 来 (come, since). The literal sense 'since coming to life' developed into the adverbial meaning 'by nature, from birth'.