na-Adjectives: Present | Japanese Grammar

Japan's second class of adjectives, the な-adjectives (grammatically 形容動詞（けいようどうし）, "adjectival verbs," but really best understood as adjectival nouns), work in a completely different way from い-adjectives. Where an い-adjective is verb-like and predicates on its own, a な-adjective is noun-like and cannot predicate by itself — it borrows the copula だ/です, exactly as a noun does. Internalize that one fact and every form a な-adjective ever takes becomes predictable.

The core idea: a な-adjective is a describing noun

Take 静か（しずか） "quiet." Grammatically it behaves like the noun 学生（がくせい） "student," not like the adjective 高い "expensive." A student cannot end a sentence alone (彼は学生 feels unfinished); you need だ or です to close it. A な-adjective is the same: 静か cannot stand as a predicate by itself — it needs the copula.

この部屋は静かです。

kono heya wa shizuka desu

This room is quiet.

彼はとても親切だ。

kare wa totemo shinsetsu da

He's very kind. (plain)

Compare the machinery side by side:

	Sentence	What predicates
noun	彼は学生だ／です	copula だ／です
な-adjective	彼は親切だ／です	copula だ／です
い-adjective	それは高い（。）	the adjective itself

The noun and the な-adjective are in the same row for a reason: they run on the same engine. This is why linguists call な-adjectives "adjectival nouns" — and why learning them as nouns that happen to describe predicts all of their behavior.

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Every strange thing a な-adjective does — needing だ, taking だった in the past, negating with じゃない, and inserting な before a noun — is exactly what a noun does. There is nothing to memorize separately; it is all "copula behavior."

Plain vs. polite present

Plain: stem + だ — 静かだ, 便利だ, 有名だ
Polite: stem + です — 静かです, 便利です, 有名です

この駅は本当に便利です。

kono eki wa hontō ni benri desu

This station is really convenient.

あの俳優は日本でとても有名です。

ano haiyū wa nihon de totemo yūmei desu

That actor is very famous in Japan.

おばあちゃんは今も元気だよ。

obāchan wa ima mo genki da yo

Grandma's still healthy and full of energy.

Note that だ is often dropped at the end of casual speech, especially before sentence-final particles or in relaxed conversation: 「この部屋、静か（だ）ね」, 「彼、親切（だ）よ」. The bare stem is fine in that casual context — but it is a dropped copula, not a self-predicating adjective, which is a distinction the mistakes section below makes concrete.

Common な-adjectives

な-adjective	Meaning
静か	quiet
便利	convenient
有名	famous
元気	healthy, energetic
好き	fond of, likable
親切	kind
簡単	easy, simple
大変	tough, hard-going
にぎやか	lively, bustling
きれい	pretty, clean

私は辛い食べ物が好きです。

watashi wa karai tabemono ga suki desu

I like spicy food.

この漢字はとても簡単です。

kono kanji wa totemo kantan desu

This kanji is very easy.

駅前はいつもにぎやかだ。

ekimae wa itsumo nigiyaka da

The area in front of the station is always lively. (plain)

A small but important sub-group — 好き "fond of," 嫌い（きらい） "disliked," 上手（じょうず） "good at," 下手（へた） "bad at" — marks what it applies to with the particle が, not を. English "I like coffee" makes coffee an object, but 好き describes coffee as the thing that is likable, so コーヒー takes が. This flows directly from the noun-like nature of な-adjectives.

妹はピアノがとても上手です。

imōto wa piano ga totemo jōzu desu

My little sister is very good at piano.

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な-adjectives of ability and preference (好き, 嫌い, 上手, 下手) take が for their target, never を: コーヒーが好き, not ×コーヒーを好き. This は…が pattern is a hallmark of adjectival predicates.

The きれい trap

きれい ("pretty / clean") ends in the sound い, so beginners file it under い-adjectives and conjugate it like 高い. It is a な-adjective — the final い is part of the noun-like stem, not the adjective ending -い. The giveaway is that its kanji form is 綺麗, where the い is inside the second character, not a grammatical suffix. The same trap catches 嫌い（きらい） "disliked." Treat both as nouns: きれいです, きれいじゃない, きれいだった — never ×きれくない or ×きれかった.

このホテル、部屋がすごくきれいですね。

kono hoteru, heya ga sugoku kirei desu ne

This hotel — the rooms are really nice/clean, aren't they.

The attributive is the one twist: な before a noun

When a な-adjective sits directly before a noun to modify it, it takes な rather than だ. This is the form the whole class is named after.

静かな公園を探しています。

shizuka na kōen o sagashite imasu

I'm looking for a quiet park.

京都には有名なお寺がたくさんあります。

kyōto ni wa yūmei na otera ga takusan arimasu

There are lots of famous temples in Kyoto.

You can read that な as the copula's special "before a noun" costume — a noun modifying another noun uses の (私の本), and a な-adjective modifying a noun uses な. The full behavior of that な gets its own page: な-adjectives before a noun.

How this differs from English

English has one adjective slot that works everywhere: "a quiet room" and "the room is quiet" use the identical word "quiet." Japanese splits the job across two costumes for な-adjectives — な before a noun (静かな部屋) and だ/です as a predicate (部屋は静かです) — and neither costume is the bare stem. English gives you no reason to expect a copula after "quiet," which is exactly why the errors below feel counterintuitive at first.

Common mistakes

❌ この町は静か。

Incorrect as a full polite/declarative sentence — a な-adjective needs the copula to predicate.

✅ この町は静かです。／静かだ。

kono machi wa shizuka desu / shizuka da

This town is quiet. (polite / plain)

❌ この町は静かな。

Incorrect — な only goes before a noun, never at the end of a sentence.

✅ この町は静かだ。

kono machi wa shizuka da

This town is quiet. (な appears only before a noun, as in 静かな町 'a quiet town')

❌ 彼はとても親切いです。

Incorrect — な-adjectives take no い; they run on the copula.

✅ 彼はとても親切です。

kare wa totemo shinsetsu desu

He is very kind.

❌ このホテルはきれかった。

Incorrect — きれい is a な-adjective, so it can't take the い-adjective past 〜かった.

✅ このホテルはきれいだった。／きれいでした。

kono hoteru wa kirei datta / kirei deshita

This hotel was clean/beautiful. (plain / polite)

The pattern behind all four is the same misreading: expecting a な-adjective to predicate on its own like an い-adjective. It cannot. Anchor it to the noun family in your head — "静か is a 'quiet-noun,' and nouns need だ/です" — and the present, the negative, the past, and the attributive な all fall into place with no new rules.

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