Innate cheerfulness; a naturally bright, upbeat disposition (often used colloquially, opposite of 根暗).
彼は生まれつき根明で、どんな場所でもすぐに溶け込む。
He is naturally cheerful and fits in quickly anywhere.
根明な性格の人は職場の雰囲気を明るくすることが多い。
People with a naturally cheerful disposition often brighten the workplace atmosphere.
根明と根暗は性格の違いを説明するときの対比でよく使われる。
The contrast between ねあか and ねくら (根暗) is often used to describe personality differences.
A person who is innately cheerful; a happy-go-lucky or naturally optimistic person (colloquial).
田中さんは本当にねあかで、初対面でも話しやすい。
Mr. Tanaka is really cheerful and easy to talk to even on a first meeting.
仕事はきついけれど、ねあかの友達がいると気分が楽になる。
Work is tough, but having a cheerful friend makes things easier.