Japanese な Adjectives: Complete List of 80 Patterns with Examples

Japanese adjectives fall into two camps, and な-adjectives (na-keiyoushi / 形容動詞) are the trickier of the two. They behave partly like nouns, require な before nouns, and conjugate completely differently from い-adjectives. This guide covers every conjugation form, 40 of the most common な-adjectives you will encounter, how to tell them apart from い-adjectives, and the mistakes that trip up learners at every level.

What is a な-adjective?

A な-adjective is an adjective that inserts な (na) when placed directly before a noun:

• きれいな花 — a beautiful flower
• 静かな部屋 — a quiet room
• 有名な俳優 — a famous actor

When the adjective appears in predicate position (after the noun it describes, before です), the な disappears:

• 花はきれいです。— The flower is beautiful.
• 部屋は静かです。— The room is quiet.

Grammatically, な-adjectives behave like nouns followed by だ/です. That is why their conjugation uses the same endings as nouns: だった (past), じゃない (negative), etc.

な-adjective conjugation table

Using 静か (shizuka, quiet) as the example:

The adverb form (静かに) is formed by replacing な with に. This is how な-adjectives modify verbs: 静かに話してください (Please speak quietly).

40 essential な-adjectives

い-adjectives vs な-adjectives: key differences

How to tell them apart

There is no guaranteed rule, but this test works in most cases: replace the adjective with a known い-adjective like 高い and see if the conjugation pattern makes sense with くない. If the word ends in い but くない sounds wrong, it is probably a な-adjective.

Words ending in 的 (teki) such as 積極的、一般的 are always な-adjectives. Words that are Chinese-origin nouns used descriptively (元気、安全、危険) are always な-adjectives.

Common mistakes with な-adjectives

1. Negating きれい and other な-adjectives with くない

• ✗ きれいくない — wrong; treating a な-adjective like an い-adjective
• ✓ きれいじゃない — correct plain negative
• ✓ きれいではありません — correct polite negative

2. 静かいです — adding い where it does not belong

• ✗ 静かいです — incorrect; inserting a spurious い
• ✓ 静かです — correct present polite form
• ✗ 有名いな人 — incorrect modifier form
• ✓ 有名な人 — correct: famous person

3. Forgetting な before nouns

• ✗ 便利アプリ — missing な
• ✓ 便利なアプリ — correct: a convenient app
• ✗ 必要書類 — technically valid as a compound noun, but as an adjective needs な
• ✓ 必要な書類 — correct: necessary documents

4. Past tense: using でした incorrectly

• ✗ 静かいでした — wrong; mixing い-adj past with な-adj
• ✓ 静かでした — correct polite past
• ✓ 静かだった — correct plain past

Real sentences with な-adjectives

• この街はとても賑やかです。
  Kono machi wa totemo nigiyaka desu.
  This city is very lively.
• 彼女は親切な人です。
  Kanojo wa shinsetsu na hito desu.
  She is a kind person.
• その問題は複雑じゃなかった。
  Sono mondai wa fukuzatsu ja nakatta.
  That problem was not complicated.
• 日本語が得意になりたい。
  Nihongo ga tokui ni naritai.
  I want to become good at Japanese.

Make sure your な-adjective conjugation is correct before submitting essays or messages. Paste your Japanese into ZISTICA MOJIIQ's free grammar checker and get instant AI feedback on every adjective form, particle, and verb ending.

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