🦅 Project Eagle
Quintuple VS

Synonym Boundary: "いい", "良い", "おはようございます", "得意な", "朗報"

All represent the core concept "good", but require precise selection.

Japanese Option A

いい

いい (ii)
N5 / CEFR
Japanese Option B

良い

よい (yoi) / いい (ii)
N5 / CEFR
Japanese Option C

おはようございます

おはようございます (ohayou gozaimasu)
N5 / CEFR
Japanese Option D

得意な

とくいな (tokui na)
N4 / CEFR
Japanese Option E

朗報

ろうほう (rōhō)
N2 / CEFR

Quintuple VS Nuance Contrast & Social Differences

When expressing "good" in Japanese, you must carefully distinguish between "いい", "良い", "おはようございます", "得意な", "朗報" based on context.
  • いい (いい (ii) - Level: N5): Maps to "good, nice; okay" and is used when An い-adjective, a versatile word meaning 'good,' 'nice,' 'fine,' 'okay.' Often used to express approval or agreement. The more formal or classical form is よい.
  • 良い (よい (yoi) / いい (ii) - Level: N5): Maps to "good, nice" and is used when 「良い」.
  • おはようございます (おはようございます (ohayou gozaimasu) - Level: N5): Maps to "Good morning." and is used when Used in the morning, typically until around noon. More polite than just 「おはよう」.
  • 得意な (とくいな (tokui na) - Level: N4): Maps to "good at, strong in, one's forte" and is used when A な-adjective. Opposite of 苦手な. Used to express being good at something, or having a skill. Often paired with the particle が.
  • 朗報 (ろうほう (rōhō) - Level: N2): Maps to "Good news; glad tidings" and is used when Used to express positive and often significant news. Can be a bit formal. 朗報を伝える.
Mixing these up can easily lead to unnatural translations. Refer to the bilingual context cards below to master the boundaries!
Context for "いい"
その考えはとてもいいです。/ 大丈夫、いいですよ。
That's a very good idea. / It's okay.
Context for "良い"
これは良い本です。
This is a good book.
Context for "おはようございます"
おはようございます!今日も一日頑張りましょう。
Good morning! Let's do our best today too.
Context for "得意な"
彼はスポーツが得意で、特に水泳が得意です。
He is good at sports, especially swimming.
Context for "朗報"
先生から合格の朗報を聞いて、とても嬉しかった。
I was very happy to hear the good news of my success from the teacher.

Synonym Mastery Challenge

Which Japanese word perfectly fits this blank space?

Fill in the blank: "その考えはとても ___ です。/ 大丈夫、 ___ ですよ。" (Meaning: "That's a very good idea. / It's okay.")
🎉 Correct Answer!

Remember: "いい" is correct here because it represents "good, nice; okay" in the context: "That's a very good idea. / It's okay.".

💡 Practice with AI! Live

Don't just read. Practice speaking this grammar with our interactive AI coach for free!

Try AI Speaking 👉