How to say "bright" in Japanese

• 明るいあかるいJLPT N5approx.Common
  i-adjectiveCovers the basic sense of bright: a room, day, or scene filled with light. It also describes a cheerful, sunny personality, so a bright smile or disposition is 明るい as well.
  ダイヤは明あかるく光ひかった。↗

  The diamond shone brightly.
• 鮮やかあざやかJLPT N1approx.Common
  na-adjectiveBright in the sense of vivid and brilliant — striking, clear color. Use it for brilliant hues and vivid coloring; it is about how color strikes the eye, not how much light fills a room.
  月つきは鮮あざやかに輝かがやいていた。↗

  The moon was shining brightly.
• つやつやCommon
  adverb (with と), suru verb, no-adjectiveBright as in glossy: a surface with a lustrous sheen, such as glossy hair or a well-polished finish. Usually written in kana alone, it describes shine rather than illumination.
• 利口りこうJLPT N3approx.Common
  na-adjective, nounBright meaning clever: an intelligent, quick-witted person, often a child or pet praised for being smart. It has nothing to do with light; for a bright child, this is the word.
  しかし、トニーは利口りこうな少年しょうねんではありませんでした。↗

  But Tony was not a clever boy.
• 赤々あかあかCommon
  adverb (with と)Not a general word for bright: it paints something red glowing brightly — a blazing fire, red flames. Unless the bright thing is red, this is seldom the word you want.
  火ひは赤々あかあかと燃もえていた。↗

  The fire was burning brightly.

Choose 「明るい」 for brightness from light or a cheerful mood, 「鮮やか」 for vivid brilliant color, 「つやつや」 for a glossy sheen, 利口 for a clever person, and 赤々 only for things glowing bright red.

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

• 明るいあかるいlight
• 鮮やかあざやかvivid
• つやつやglossy
• 利口りこうclever
• 赤々あかあかbright red
• 晴れ晴れはればれbright
• 英明えいめいintelligent
• 明朗めいろうcheerful
• 輝かしいかがやかしいbrilliant
• にこやかsmiling
• うららbright (weather, mood, voice, etc.)
• うららかbright (weather, mood, voice, etc.)
• 赫灼かくしゃくbright
• 頭のいいあたまのいいbright
• 頭がいいあたまがいいbright
• 頭いいあたまいいbright
• 皓々こうこうbright (esp. of the moon)
• 皎々きょうきょうbright (esp. of the moon)
• 煌々こうこうbrilliant
• 晴れやかはれやかclear
• さやかclear
• さんさんbrilliant
• 燦然さんぜんbrilliant
• 利発りはつclever
• 赫々かくかくbrilliant
• 怜悧れいりclever
• 燦爛さんらんbrilliant
• 炯然けいぜんshining
• 頭の回転の速いあたまのかいてんのはやいquick-witted
• 頭の回転が速いあたまのかいてんがはやいquick-witted
• 光札ひかりふだ20-point card
• 朗々ろうろうclear
• 鮮麗せんれいvivid
• 晴れ晴れしいはればれしいclear
• 明らかあきらかbright
• 涼しいすずしいclear (e.g. eyes)
• 朗らかほがらかbright (sky, day, etc.)
• バラ色バラいろbright (e.g. life, future, prospects)
• 涼しげすずしげclear (of sound, objects, etc.)
• 光り物ひかりもの20-point card