How to say "red" in Japanese

Choosing the right word
  • 赤あかJLPT N5approx.Common
    no-adjectiveThe plain noun for the color itself: talking about red as a color, naming it, or contrasting it with other colors. It covers red, crimson and scarlet alike.
    信号機しんごうきが赤あかの間あいだは道路どうろを渡わたるな。↗
    Don't cross the road when the signal is red.
  • 赤いあかいJLPT N5approx.Common
    i-adjectiveThe adjective for describing something as red: things whose color is red, crimson, scarlet or vermilion. This is the word you reach for to say that an object or surface is red.
    彼女かのじょは赤あかいスカートをはいていた。↗
    She was wearing a red skirt.
  • レッドCommon
    no-adjectiveThe borrowed English word: it turns up where the English term is carried over as-is — names, labels, color listings — rather than serving as the ordinary word for describing something as red.
  • 赤色あかいろCommon
    no-adjectiveExplicitly 'the color red': use it when the color is being named, specified or listed as a color in its own right, rather than when simply describing something as red.
    この赤色あかいろで柄がら全体ぜんたいがだいなしだ。↗
    The red kills the whole pattern.
  • 朱あけCommon
    no-adjectiveReally a color name for the vermilion, cinnabar shade — a bright red tinged with orange — rather than the everyday word for red. Unless that specific shade is meant, 赤 or 赤い is what you want.

Use 「赤い」 to describe things as red and 赤 for the color itself; 赤色 names the color explicitly; 「レッド」 is the borrowed English word for names and labels; 朱 is the vermilion shade, not general red.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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