Jisho

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Noun, Na-adjective (keiyodoshi)
1. innate cheerfulnessUsually written using kana alone, Antonym: 根暗
Noun
2. innately cheerful person; happy-go-lucky person; natural optimistUsually written using kana alone
Other forms
根明か 【ねあか】ネアカ
Notes
根明か: Irregular okurigana usage.

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