Jisho

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Adverb (fukushi), Noun which may take the genitive case particle 'no', Noun
1. by nature; naturally; by birth; innately; congenitally
Other forms
生来 【しょうらい】性来 【せいらい】性来 【しょうらい】
Notes
性来: Rarely-used kanji form. 性来: Rarely-used kanji form.

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