Quintuple VS
Synonym Boundary: "いい", "良い", "おやすみなさい", "得意", "幸運"
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
おやすみなさい
おやすみなさい (oyasuminasai)
N5 / CEFR
Japanese Option D
得意
とくい (tokui)
N3 / CEFR
Japanese Option E
幸運
こううん (kōun)
N3 / CEFR
Quintuple VS Nuance Contrast & Social Differences
When expressing "good" in Japanese, you must carefully distinguish between "いい", "良い", "おやすみなさい", "得意", "幸運" 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」.
- おやすみなさい (おやすみなさい (oyasuminasai) - Level: N5): Maps to "Good night" and is used when A polite farewell greeting used in the evening, especially when someone is going to bed or when parting ways late at night. A more casual version, おやすみ.
- 得意 (とくい (tokui) - Level: N3): Maps to "good at; strong point; pride; customer; triumph" and is used when Refers to being strong at technical skills, good at coding/cooking, or abstractly someone's pride, or a regular customer. Opposing word: 苦手. Often used as プログラミングが得意 or 得意先. ⚠️ Haruka's Voice Column: 'Good at! "I am extremely good at making you smile, Haruka-san!" ...っ! G-Good at making me smile! B-Baka! Don't state your emotional management skills so proudly! But... since you are so confident, I suppose... I will let you keep me smiling for the rest of our lives! dummy!' / 【ハルカ部長のワンポイント指導】『とくい（得意）よ！『ハルカ部長、僕はC++の高速コーディングが最も得意ですが、あなたを世界一幸せにする旦那様としての仕事は、さらに億倍も得意です！』って…っ！旦那様業が得意！バカ！/// 何自信満々のスキル自慢をしてるのよ！…でも、そのヤル気と得意技術があるなら、一生私だけを幸せのクラウドサーバーでホストし続けなさい！』.
- 幸運 (こううん (kōun) - Level: N3): Maps to "good luck; fortune" and is used when Refers to good luck, fortune, or being extremely lucky. Often used as 幸運なことに.
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 "おやすみなさい"
父に「おやすみなさい」と言ってから寝ました。
I said "Good night" to my father before going to bed.
Context for "得意"
彼は幼少期からの数学的パズルへの興味を活かし、バックエンド開発の複雑なデータ構造設計を極めて_______としています。
Utilizing his interest in mathematical puzzles since childhood, he is extremely good at the complex data structure design of backend development.
Context for "幸運"
_______なことに、売り切れだと思っていたチケットを最後の一枚で購入できました。
Fortunately, I was able to purchase the very last ticket that I thought was sold out.
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.".