明るい|あかるいakarui[0]heiban (flat)

1. i-adjectivelight; bright; well-lit; well-lighted
   ダイヤは明あかるく光ひかった。↗

   The diamond shone brightly.
2. i-adjectivebright (colour)
   明あかるい色いろが私わたしたちの目めを引ひいた。↗

   The bright colors arrested our eyes.
3. i-adjectivecheerful; bright; spirited; sunny (e.g. disposition)
   あの子供こどもは明あかるい微笑びしょうでみんなをひきつける。↗

   The child captivates everyone with his sunny smile.
4. i-adjectivebright (future, prospects, etc.); rosy; encouraging; promising
5. i-adjectiveknowledgeable (about); familiar (with); well versed (in); well acquainted (with)as ...に明るい
   君きみはなかなか地理ちりに明あかるいな。↗

   You're pretty good with the lay of the land.
6. i-adjectivefair (e.g. politics); clean; impartial

• Related眩しいまぶしいNeutralFor light so strong it hurts the eyes, or people and things dazzlingly brilliant; stresses the dazzle rather than plain brightness.
• Related輝かしいかがやかしいWrittenWritten word for brilliant achievements or prospects, as in 「輝かしい未来」; mostly used of abstract things rather than physical light.
• Related朗らかほがらかNeutralCheerful and open in personality or mood, as in 「朗らかな笑顔」; centres on a sunny state of mind rather than light.
• Related陽気ようきNeutralCheerful and fond of lively fun, as in 「陽気な人」; can also refer to weather or season.
• Related快活かいかつWrittenWritten-flavoured word for a brisk, cheerful personality, as in 「快活な少年」.
• Related明朗めいろうWrittenFormal word for a cheerful personality, but also for transparency and fairness in accounts or politics, as in 「明朗会計」.
• Related活発かっぱつNeutralLively and active in movement or character; stresses energy, while 「明るい」 stresses cheerfulness.
• Related楽観的らっかんてきNeutralOptimistic — always expecting things to turn out well; about one's outlook, as in 「楽観的な見方」.
• Related華やかはなやかNeutralGorgeous and eye-catching, as in 「華やかな衣装」; stresses glamour and splendour rather than plain brightness.
• RelatedピカピカCasualColloquial mimetic word for something sparkling or brand new, as in 「ピカピカの靴」.
• Related晴れ晴れしいはればれしいWrittenWritten word for a carefree, refreshed mood or a cloudless sky, as in 「晴れ晴れしい顔」; stresses the feeling.
• Related晴れやかはれやかWrittenWritten word for a bright, beaming mood or a festive occasion, as in 「晴れやかな表情」; strongly literary.
• RelatedうららかWrittenLiterary word for mild, sunny spring weather with a relaxed feel; mostly seen in writing.
• Antonym暗いくらいNeutralThe antonym: little light, or a gloomy mood or outlook.

「明るい」 is the default for both physical brightness and a cheerful personality. Use 「眩しい」 for light that dazzles, 「輝かしい」 for brilliant prospects, 「朗らか」 or 「陽気」 for a sunny character, 「華やか」 for glamour, and 「暗い」 for darkness; the rest are narrower or more written alternatives.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 光ひかりが多おおい。光度こうどが高たかく、ものがよく見みえる。
2. 色いろが見みやすい。
3. (陽ひるい) 気分きぶんや性格せいかくが生き生いきいきとしている。
4. 上手うまく事ことがはこびそうである。将来性しょうらいせいがあり調子ちょうしがいい。
5. 物事ものごとに詳くわしい。知識ちしきや経験けいけんが多おおい。