Introduction
If you’re learning Japanese, mastering adjectives is essential for describing people, objects, and experiences. Unlike English, Japanese adjectives conjugate and behave differently based on their type.
In this guide, we’ll break down:
✔ The two types of Japanese adjectives (i-adjectives & na-adjectives)
✔ How to conjugate them (past, negative, and polite forms)
✔ Practical examples for real-life conversations
✔ Common mistakes beginners make
By the end, you’ll confidently use adjectives in everyday Japanese!
(Looking for more beginner tips? Check out our Reddit’s Favorite Japanese Grammar Apps in 2025: The Ultimate Guidefor a solid foundation.)
Types of Japanese Adjectives
Japanese adjectives fall into two main categories:
- い-Adjectives (i-adjectives) – End with い (e.g., たかい takai – expensive)
- な-Adjectives (na-adjectives) – Require な before nouns (e.g., しずか shizuka – quiet)
Let’s explore each in detail.
1. い-Adjectives (i-Adjectives)
These adjectives always end with い when in their dictionary form.
Examples:
- あつい (atsui) – hot
- たかい (takai) – expensive
- おもしろい (omoshiroi) – interesting
Conjugating い-Adjectives
Unlike English, Japanese adjectives change form based on tense and politeness.
| Form | Rule | Example (たかい – expensive) |
|---|---|---|
| Present Affirmative | Same as dictionary form | たかい (takai) |
| Present Negative | Replace い with くない | たかくない (takakunai) – not expensive |
| Past Affirmative | Replace い with かった | たかかった (takakatta) – was expensive |
| Past Negative | Replace い with くなかった | たかくなかった (takakunakatta) – wasn’t expensive |
Example Sentences:
- このパソコンはたかいです。 (Kono pasokon wa takai desu.) – This laptop is expensive.
- このパソコンはたかくなかった。 (Kono pasokon wa takakunakatta.) – This laptop wasn’t expensive.
💡 Pro Tip: Some words end with い but are na-adjectives (e.g., きれい kirei – pretty). Watch out for exceptions!
(Want to expand your vocabulary? Here’s a JLPT N5 Vocabulary List: 200 Must-Know Words for Beginners to practice with.)
2. な-Adjectives (Na-Adjectives)
These adjectives do not end in い (with exceptions like きれい kirei). They require な when modifying a noun.
Examples:
- しずか (shizuka) – quiet
- べんり (benri) – convenient
- ハンサム (hansamu) – handsome
Conjugating な-Adjectives
Since they behave like nouns, we use です (desu) and だった (datta) for conjugation.
| Form | Rule | Example (しずか – quiet) |
|---|---|---|
| Present Affirmative | Add です | しずかです (shizuka desu) |
| Present Negative | Replace です with じゃない/ではありません | しずかじゃない (shizuka ja nai) |
| Past Affirmative | Replace です with だった | しずかだった (shizuka datta) |
| Past Negative | Replace です with じゃなかった/ではありませんでした | しずかじゃなかった (shizuka ja nakatta) |
Example Sentences:
- このへやはしずかです。 (Kono heya wa shizuka desu.) – This room is quiet.
- このへやはしずかじゃなかった。 (Kono heya wa shizuka ja nakatta.) – This room wasn’t quiet.
⚠ Watch Out! Some words like きれい (kirei – pretty) look like i-adjectives but are na-adjectives. Always double-check!
Practical Applications: Using Adjectives Naturally
Now that you know the basics, let’s see how adjectives work in real conversations.
1. Describing Objects & People
- このケーキはおいしい！ (Kono keeki wa oishii!) – This cake is delicious!
- わたしのせんせいはしんせつです。 (Watashi no sensei wa shinsetsu desu.) – My teacher is kind.
2. Making Comparisons
Use より (yori) for “more than” and いちばん (ichiban) for “the most.”
- コーヒーよりおちゃのほうがやすい。 (Koohii yori ocha no hou ga yasui.) – Tea is cheaper than coffee.
- これはいちばんべんりなアプリです。 (Kore wa ichiban benri na apuri desu.) – This is the most convenient app.
3. Expressing Preferences
- あのレストランはあまりおいしくない。 (Ano resutoran wa amari oishikunai.) – That restaurant isn’t very tasty.
- にほんのえいががすきです。 (Nihon no eiga ga suki desu.) – I like Japanese movies.
📌 Insight: Japanese often drop the subject if it’s clear from context. For example, instead of saying “わたしは” (watashi wa – I am), you can just say “たかいです” (takai desu – [It] is expensive).
Common Mistakes to Avoid
- Mixing up い & な-Adjectives
- ❌ きれいだ (Correct: きれいな)
- ✅ きれいなはな (kirei na hana – pretty flower)
- Forgetting Negative Conjugations
- ❌ たかいじゃない (Wrong for i-adjectives)
- ✅ たかくない (takakunai)
- Overusing です in Casual Speech
- In informal settings, you can drop です:
- このえいが、おもしろい！ (Kono eiga, omoshiroi!) – This movie is interesting!
- In informal settings, you can drop です:
Final Thoughts
Mastering Japanese adjectives takes practice, but once you understand the two types (i-adjectives & na-adjectives) and their conjugations, you’ll describe things more naturally.
Quick Recap:
✔ い-Adjectives end with い and conjugate directly.
✔ な-Adjectives need な before nouns and use です for politeness.
✔ Watch out for exceptions (like きれい).
Next Steps:
- Practice with flashcards (Anki is great for this).
- Listen to Japanese podcasts or dramas to hear adjectives in action.
- Try writing simple sentences daily.
(Need more grammar help? Explore our JLPT N5 Grammar Test: A Complete Guide with Practice Exercises for deeper learning.)
FAQs About Japanese Adjectives
Q: Can an adjective end in い but be a na-adjective?
A: Yes! きれい (pretty) and ゆうめい (famous) are na-adjectives despite ending in い.
Q: How do I say “very” in Japanese?
A: Use とても (totemo) or すごく (sugoku) before the adjective:
- とてもたかい (totemo takai) – very expensive
Q: Are there irregular adjectives?
A: The only major irregular adjective is いい (good), which conjugates as よい (yoi) in negative/past forms.
Further Learning Resources
- Tae Kim’s Guide to Japanese Adjectives (Great free resource)
- JapanesePod101 Adjective Lesson (Video explanations)
- How Japanese Grammar Connects with Sentence Structure: A Detailed Guide
Now it’s your turn! Try making 3 sentences using i-adjectives and na-adjectives in the comments. がんばって！(Ganbatte! – Good luck!)
