Nu, Zu, and Zaru: Literary Negatives You Will Meet

Why an old negative is still worth learning

Japanese did not always negate with nai. The older system used zu, whose forms spread through the sentence in different shapes: zu when it modified a verb, nu when it stood at the end or before a noun, and zaru in some fixed constructions. Modern Japanese replaced all of that with nai, but the older forms were never fully cleared out. They stayed inside proverbs, on public signs, in book and film titles, in legal and administrative language, in song lyrics, and in a handful of ordinary adverbs nobody thinks of as archaic.

The practical consequence is one-sided. You will never be required to produce these forms, and using them in conversation would sound theatrical. But if you cannot read them, a sign says nothing to you and a proverb turns into a puzzle. This guide is therefore a recognition guide: learn the shapes, learn the modern equivalent for each, and keep speaking with nai.

One stem, three endings

The good news is that you already know the stem. Nu, zu and zaru attach to exactly the same base as nai: the a-row stem for godan verbs, the bare stem for ichidan verbs. So if you can say ikanai, you can read ikanu, ikazu and ikazaru without learning anything new. The only work is memorising the two irregulars and one spelling trap.

The spelling trap is the u-ending godan verbs. Just as iu becomes iwanai and not ianai, it becomes iwazu and not iazu; the same w appears in omowazu, kamawazu and shiawase o negawazu. The irregular to memorise is suru, whose forms all begin with se: senu, sezu, sezaru. Kuru follows its usual pattern and reads ko, giving konu, kozu and kozaru. Aru is the odd one out entirely, since its negative is simply nai, though the classical arazu survives in fixed phrases such as sa ni arazu, meaning that is not so.

Nu at the end of a sentence and before a noun

Nu does two jobs in the text you will meet. It can close a sentence, which reads as formal, old or emphatic, and it can sit directly before a noun, where it replaces the nai of a relative clause. Shiranu hito is simply a person one does not know; yokisenu jitai is an unforeseen situation. In both positions, translating nu as nai gives you the meaning immediately.

Note the last two rows. Nebanaranu is the older shape of nakereba naranai, and you will meet it in period drama and in written slogans. The contracted n, as in wakaran, shiran and dekin, is alive in casual speech and in western Japanese, so a form that looks archaic on the page can be very ordinary in a conversation. Neither is something to add to your own speech before you can hear which one a room is using.

Zu as the written adverbial negative

Zu is the form that connects. It negates a verb and then hands the sentence on to the next clause, exactly as the negative te-form nakute or naide does in speech. In writing, zu is compact and neutral, which is why report and news style uses it constantly. A sentence such as denwa ni mo dezu, renraku mo torenakatta packs two clauses together with no wasted syllables.

In these sentences zu is not the final negative of the sentence; it negates one clause and continues. That is exactly the job of nakute and naide in speech, so when you convert a written line for a conversation, iwazu becomes iwanaide and matazu becomes matanaide. The other direction, tightening a spoken paragraph into written style, is covered in the guide on choosing a Japanese written style.

Zu ni: without doing something

Zu ni is the pattern you will actually see most often, and it is the written equivalent of naide. It means without doing the action, and it attaches to the same stem as everything else in this guide. Asagohan o tabezu ni dekaketa means she went out without eating breakfast, and it says the same thing as tabenaide dekaketa with a more formal surface.

The suru form is where learners stumble. Without doing something is sezu ni, never shizu ni. Renraku sezu ni, kakunin sezu ni and yoyaku sezu ni are all common in written Japanese, and each one has a plain spoken twin ending in shinaide. Keep both halves of each pair in your notes so that reading and speaking stay connected.

One caution about naide: it also forms a request, as in minaide kudasai, please do not look. Zu ni never does that. If you need to ask someone not to do something, the spoken naide kudasai is the only natural choice, and no amount of formality turns it into sezu ni kudasai.

Zaru in fixed expressions

Zaru is the form you should treat almost entirely as vocabulary. It appears before nouns and inside a small number of set constructions, of which sezaru o enai is by far the most common: it means cannot help doing, or has no choice but to do. The pattern is verb stem plus zaru o enai, so mitomezaru o enai means one has to admit it, and yameru gives yamezaru o enai, one has no choice but to stop.

Zaru o enai has a plain spoken equivalent in shika nai or nakereba naranai, so kyanseru sezaru o enai and kyanseru suru shika nai carry the same practical message with very different weight. Use the heavy written form when you want the reader to understand that the decision was forced, which is exactly why it fills company announcements.

Fixed phrases you will actually meet

Look at how many of these have quietly become ordinary vocabulary. Omowazu, aikawarazu, taezu and makezugirai are everyday words that nobody experiences as classical, and you should feel free to use them in speech. The proverbs in the lower rows are different: they are quoted as units, usually with a knowing tone, and a learner who deploys one at the wrong moment sounds as if they have swallowed a phrasebook.

Where a modern reader meets these forms

• Public and workplace signs, especially older or deliberately formal ones.
• Proverbs and four-character idioms, where the classical shape is fossilised.
• Book, film and song titles, which favour compact and slightly archaic phrasing.
• Legal, administrative and contract language, which preserves older written norms.
• Newspaper sentences, where zu joins clauses without spending characters.
• Period drama and historical fiction, where nu and zu mark the era of the speech.
• Song lyrics, which use nu and zu for rhythm and for a literary tone.

Signage is worth a separate note. The old prohibition ending bekarazu, as in tachiiru bekarazu meaning entry is forbidden, belongs to the same classical family and is built from beshi rather than from zu. Most modern signs prefer the plain noun tachiiri kinshi or the polite go-enryo kudasai, so bekarazu now reads as stern or old-fashioned, which is sometimes exactly the effect intended.

Reading signs and titles out loud

These are lines you will read aloud rather than compose, plus the questions you ask when a phrase defeats you. Practise the questions especially, because knowing how to ask about an unfamiliar form is worth more than memorising twenty more of them.

A likely reply to the first question is Mukashi no uchikeshi desu, meaning it is an old negative, or Ima wa amari tsukaimasen ga, kanban ya kotowaza ni nokotte imasu, meaning it is not much used now but it survives on signs and in proverbs. Both answers tell you the same thing this guide does, and hearing them from a native speaker fixes it faster than reading it.

A recognition drill, not a production drill

• Read a phrase, cover it, and say the nai version aloud: iwazu becomes iwanaide.
• Sort every new example into three buckets: sentence-final nu, connecting zu, and fixed zaru.
• Drill the suru row alone until senu, sezu and sezaru come faster than shinai.
• Photograph one formal sign a week and decode its ending before looking anything up.
• Keep a page of proverbs with the modern paraphrase written beside each one.
• Never insert nu or zu into your own conversation until you have heard a native speaker use that exact phrase.

The last rule matters most. These forms give a text authority, but in a learner's spoken sentence they usually give the wrong impression, as if a formal document had started talking. Understand every one of them on sight, keep the fixed adverbs such as omowazu and kanarazu in active use, and let the rest stay where they belong, on the page.