The Ultimate Ban: Must Not / Is Forbidden (〜べからず)
Grammar Rule in 30 Seconds
Use {〜べからず|〜べからず} to express a stern, formal, or archaic prohibition that implies an absolute rule or law.
- Attach to the dictionary form of a verb: {入る|はいる} + べからず = {入るべからず|はいるべからず}.
- It functions as a command that cannot be ignored, often found on signs or in legal texts.
- It is strictly literary or formal; never use this in casual conversation with friends.
Overview
〜べからず is one of the most powerful and uncompromising expressions of prohibition in the Japanese language. It translates to an absolute "must not" or "is forbidden," carrying a weight and finality that far exceeds more common negative commands. For the C2 learner, 〜べからず is not merely another way to say "don't"; it is a fossilized piece of classical grammar that functions as a high-level stylistic and rhetorical device in modern Japanese.
Its presence signals an unchangeable rule, an impersonal decree, or a solemn, timeless principle.
Unlike the everyday prohibitions of 〜てはいけない (must not) or the requests of 〜ないでください (please don't), 〜べからず is inherently archaic, formal, and objective. Stemming from 文語|ぶんご (classical Japanese), its use is confined to specific, high-stakes contexts: public signs, legalistic notices, ancient proverbs, and literary works aiming for a grave or dramatic tone. Understanding this grammar is to understand the voice of impersonal authority in Japanese culture—the disembodied command on a temple wall or the foundational rule of a martial arts dojo.
Mastering it allows you to decode these powerful messages and appreciate the nuances of register and style at an expert level.
How This Grammar Works
〜べからず is a direct inheritance from classical Japanese, and its unyielding force comes from its components: the auxiliary verb べし and the classical negative suffix ず. In classical Japanese, べし was a versatile auxiliary that conveyed a spectrum of meanings including strong intention, appropriateness, or necessity—similar to the English "must," "should," or "ought to."べし itself conjugated like an adjective (形容詞型|けいようしがた auxiliary). The crucial point for understanding 〜べからず lies in its 未然形|みぜんけい, or irrealis form, which is べから. The classical negative suffix ず attaches to this 未然形 to negate the verb or auxiliary that precedes it.べから (未然形 of べし) + ず (Classical Negative Suffix) → べからず〜べきだ ("should"), which evolved from the 連体形|れんたいけい (attributive form) of べし, which was べき.べし is the core connecting these two seemingly different grammar points.〜べからず. It doesn't reflect the speaker's personal feelings or a temporary rule. Instead, it states an objective, unassailable law.立入るべからず ("Do Not Enter") isn't a person's request; it is the enactment of an established, non-negotiable directive. The authority comes from the rule itself, not the person who wrote it.Formation Pattern
〜べからず is exceptionally simple, as it is a fixed phrase that does not change. It attaches directly to the dictionary form (辞書形|じしょけい) of a verb.
べからず
する.
〜べからず Form | English Meaning |
歩く | 歩く | 歩くべからず | Must not walk |
食べる | 食べる | 食べるべからず | Must not eat |
来る | 来る | 来るべからず | Must not come |
する:
する (to do). While するべからず is sometimes seen and is generally understood, the historically correct and stylistically superior form is すべからず. This is because the classical verb for "to do" was す, and べからず would attach directly to its dictionary form. Using すべからず demonstrates a refined understanding of the grammar's classical origins.
油断すべからず。 (One must not be careless.)
油断するべからず。 (One must not be careless.)
すべからず is the clear choice. This applies to all compound verbs ending in 〜する, such as 心配すべからず (You must not worry) or 議論すべからず (You must not argue).
When To Use It
〜べからず has a narrow and highly specialized range of use in contemporary Japanese. Its archaic and absolute character means it is reserved almost exclusively for formal, objective, and typically written contexts. Knowing where it belongs is central to C2-level mastery.- 1Public Warnings and Official Prohibitions: This is the most common modern sighting of
〜べからず. It appears on signs, notices, and official documents where rules are absolute and violations may have serious consequences. The tone is impersonal and leaves no room for negotiation.
芝生に入るべからず。(Keep off the grass. / Lit: One must not enter the lawn.)ここに駐車すべからず。(No parking here. / Lit: One must not park a car here.)危険。近寄るべからず。(Danger. Do not approach.)
- 1Proverbs, Mottos, and Foundational Principles (
格言|かくげん): The grammar lends an air of timeless wisdom and profound authority to principles and codes of conduct. It elevates a statement from advice to an enduring truth.
働かざる者、食うべからず。(He who does not work, neither shall he eat.)初心忘るべからず。(One must not forget one's original intentions/beginner's spirit. Note the classical verb忘る.)
- 1Literary and Dramatic Effect: In fiction,
〜べからずis a powerful tool to evoke a specific atmosphere. It can establish a historical setting, signal an ancient curse, or convey the immense authority of a character. You will hear it in時代劇|じだいげき(period dramas), fantasy anime, and literature where a solemn or divine command is given.
「決してその扉を開けるべからず」("Thou shalt never open that door.") — A line typical of a sage or guardian of a forbidden place.
- 1Humorous or Ironic Exaggeration (Advanced): In informal settings, among linguistically savvy friends,
〜べからずcan be used for ironic effect. By applying such a grave prohibition to a mundane situation, the speaker creates a humorous contrast. This is a high-level, playful use that requires a deep understanding of social context.
私のケーキに触れるべからず！(Thou shalt not touch my cake!) — Said with dramatic flair to a friend.
〜べからず in regular conversation, business correspondence, or any situation requiring normal politeness (敬語|けいご). It will sound jarringly out of place, pretentious, or even aggressive. For everyday prohibitions, 〜てはいけません or 〜ないでください are always the correct choices.Common Mistakes
- 1Using it in Casual Conversation: This is the most common error. Saying
「遅刻すべからず」to a friend who is running late is grammatically correct but socially bizarre. It's like saying "Thou shalt not be tardy." The statement is so formal and archaic that it creates an awkward, comical distance. Stick to遅刻しちゃだめだよor遅れないでね.
- 1Incorrect Verb Attachment: Learners often mistakenly attach
〜べからずto other verb forms, like the-ますstem or-てform. It only follows the dictionary form.
*立ち入りべからず | 立ち入るべからず | Attaches to dictionary form, not -ます stem. |*食べてべからず | 食べるべからず | Attaches to dictionary form, not -て form. |- 1Trying to Make it Polite:
〜べからずexists entirely outside the modernです/ますpoliteness system. Addingですto it (e.g.,*入るべからずです) is a fundamental error. It's an attempt to mix two incompatible grammatical eras. The form is inherently a stark, declarative statement; it cannot be softened.
- 1Confusing with
〜てはならないand〜まじき: While all express prohibition, their nuance is distinct. This is a critical C2-level distinction.
〜てはいけない: The most general prohibition. Can be subjective (お母さんがいけないと言った- Mom said I shouldn't) or objective (法律で禁止されているから、してはいけない- It's against the law, so you mustn't do it). Used in both speech and writing.〜てはならない: Stronger and more formal than〜てはいけない. Often used in written rules, regulations, and formal speeches. It conveys a strong sense of social or moral unacceptability, but it is a modern grammar form.〜べからず: Archaic, written, and impersonal. Expresses an absolute, timeless, and institutional command. The authority is external and unchallengeable.〜まじき: Also classical. Prohibits an action as being unbecoming or inappropriate for someone of a certain role or status. It's a moral judgment, not a direct command. Example:教育者としてあるまじき言動(words and actions unbecoming of an educator).
Real Conversations
In modern, spontaneous spoken Japanese, you will almost never encounter 〜べからず being used as a natural part of a speaker's own productive grammar. Its natural habitat is the written word. However, it enters conversation in a few specific ways:
Quoting a Written Source
〜べからず is part of a reported phrase, not the speaker's own voice.- A: あの古い神社の門、何て書いてあるの？ (What's written on that old shrine gate?)
- B: 「関係者以外、入るべからず」だって。 (It says, "Entry forbidden to unauthorized personnel.")
Media and Performance
Ironic/Humorous Use (Advanced): As mentioned, this is a form of linguistic play. It's common on social media for humorous effect. A user might post a photo of their cat sitting on their keyboard with the caption:
- 在宅勤務の邪魔すべからず。 (Thou shalt not interfere with the work-from-home.)
The humor comes directly from the mismatch between the trivial situation and the monumental gravity of 〜べからず.
In short, for your own speech, think of 〜べからず as a form you recognize and understand perfectly, but produce only when quoting, writing in a specific archaic style, or making a very deliberate, ironic joke.
Quick FAQ
〜べからず be used with nouns or adjectives?No. 〜べからず is a strictly verbal construction; it must follow a verb in its dictionary form to prohibit an action. To forbid a state or noun, you must use other patterns. For example, instead of *静かべからず (must not be quiet), you would have to phrase it with a verb, such as 騒ぐべからず (must not make noise).
〜べからず related to 〜べき?Yes, they are two sides of the same classical coin. Both derive from the classical auxiliary べし. 〜べきだ is the modern affirmative form, indicating what one "should" do. 〜べからず is the fossilized classical negative form, indicating what one "must not" do. Recognizing their shared origin is key to a deep understanding of both.
〜べからず have a past tense form?No. As a fixed, classical expression representing a timeless rule, it does not conjugate for tense. A sign that says 入るべからず means entry was, is, and will be forbidden. It exists outside of temporal distinctions, functioning as a perpetual decree.
〜べからず and 〜てはいけない?The main differences are register and source of authority. 〜てはいけない is a general-purpose, modern prohibition that can be personal or institutional. 〜べからず is archaic, highly formal, and almost exclusively written, conveying an absolute, impersonal decree from an unchallengeable authority (like tradition, law, or a deity).
〜べからず?Interpret them as completely non-negotiable. The rule is absolute and the context is serious. It is not a suggestion. It is a command intended to be obeyed without question, often implying a deep-rooted tradition, a legal statute, or a significant safety concern.
〜べからず in professional emails or business reports?No, almost certainly not. Its archaic and severe tone is inappropriate for modern business communication, which prioritizes clarity and professional courtesy. Using it would sound bizarre or even hostile. For formal prohibitions in a business context, use standard expressions like 〜はご遠慮ください (please refrain from...), 〜することは禁じられております (doing ~ is forbidden), or 〜ないようお願い申し上げます (we humbly request that you do not...).
Formation of べからず
| Verb Type | Dictionary Form | Prohibitive Form |
|---|---|---|
|
Godan
|
書く
|
書くべからず
|
|
Ichidan
|
食べる
|
食べるべからず
|
|
Irregular
|
する
|
するべからず
|
|
Irregular
|
来る
|
来るべからず
|
|
Godan
|
入る
|
入るべからず
|
|
Ichidan
|
見る
|
見るべからず
|
Meanings
A classical Japanese auxiliary verb used to express a strong, authoritative prohibition or a negative command.
Absolute Prohibition
Used to state that an action is strictly forbidden by authority or law.
“{立|た}ち{入|い}るべからず。”
“{触|ふ}れるべからず。”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
N/A
|
N/A
|
|
Negative
|
Verb (Dict) + べからず
|
入るべからず
|
|
Question
|
N/A
|
N/A
|
|
Past
|
N/A
|
N/A
|
|
Polite
|
N/A
|
N/A
|
|
Casual
|
N/A
|
N/A
|
Formality Spectrum
入るべからず (Signage)
入ってはいけません (Signage)
入っちゃだめ (Signage)
入んな (Signage)
The Hierarchy of Prohibition
Casual
- 〜ちゃだめ Don't do it (casual)
Standard
- 〜てはいけない Must not (standard)
Formal
- 〜禁止 Prohibited (label)
Archaic
- 〜べからず Forbidden (authoritative)
Examples by Level
{入|はい}るべからず。
Do not enter.
{触|ふ}れるべからず。
Do not touch.
{話|はな}すべからず。
Do not speak.
{見|み}るべからず。
Do not look.
{芝生|しばふ}に{入|はい}るべからず。
Do not enter the lawn.
{写真|しゃしん}を{撮|と}るべからず。
Do not take photos.
{騒|さわ}ぐべからず。
Do not make noise.
{立|た}ち{入|い}るべからず。
Do not trespass.
{許可|きょか}なく{入|はい}るべからず。
Do not enter without permission.
{私語|しご}を{慎|つつし}むべからず。
Do not whisper.
{秘密|ひみつ}を{漏|も}らすべからず。
Do not leak secrets.
{他|ほか}の{人|ひと}に{言|い}うべからず。
Do not tell others.
{公|おおやけ}の{場|ば}で{騒|さわ}ぐべからず。
Do not make noise in public.
{法|ほう}を{犯|おか}すべからず。
Do not break the law.
{己|おのれ}の{欲|よく}に{負|ま}けるべからず。
Do not give in to your desires.
{軽|かる}々しく{判断|はんだん}すべからず。
Do not judge lightly.
{歴史|れきし}を{忘|わす}るべからず。
Do not forget history.
{真実|しんじつ}を{曲|ま}げるべからず。
Do not twist the truth.
{慢心|まんしん}すべからず。
Do not be arrogant.
{時|とき}を{無駄|むだ}にするべからず。
Do not waste time.
{天|てん}の{道|みち}に{逆|さか}らうべからず。
Do not go against the way of heaven.
{武士|ぶし}の{情|なさけ}を{捨|す}てるべからず。
Do not abandon the compassion of a warrior.
{衆人|しゅうじん}の{前|まえ}で{恥|はじ}をかくべからず。
Do not embarrass yourself in front of the crowd.
{己|おのれ}を{欺|あざむ}くべからず。
Do not deceive yourself.
Easily Confused
Both mean 'must not'.
Both are used on signs.
Both are negative commands.
Common Mistakes
食べるべからずです
食べるべからず
食べてべからず
食べるべからず
べからずない
べからず
べからずます
べからず
入るべからざる
入るべからず
入るべからずだ
入るべからず
入らないべからず
入るべからず
入るべからずでした
入るべからず
入るべからずください
入るべからず
入るべからずでしょう
入るべからず
入るべからずの場所
立ち入り禁止の場所
入るべからずと聞いた
入るべからずと言われた
入るべからずを無視する
禁止を無視する
Sentence Patterns
___べからず
___に___べからず
___を___べからず
___と___べからず
Real World Usage
境内にて飲食すべからず。
無礼を働くべからず。
法を犯すべからず。
歴史を忘るべからず。
己を欺くべからず。
衆人の前で恥をかくべからず。
Don't use with friends
Look for it on signs
It's a command
Dictionary form only
Smart Tips
Recognize it as an authoritative rule.
Use it only for dramatic effect.
Identify it as a negative command.
Notice the authoritative tone.
Pronunciation
Rhythm
Pronounce with a sharp, clipped tone to emphasize the command.
Commanding
入るべからず↓
Falling intonation indicates a final, non-negotiable command.
Memorize It
Mnemonic
Think of 'べからず' as 'Be-care-less-not'. If you are careless, you will be banned!
Visual Association
Imagine an old samurai standing in front of a temple gate with a wooden sign that says '入るべからず'. The sign is glowing with authority.
Rhyme
For rules that are old and strict to the core, add べからず to the verb at the door.
Story
A young student enters a forbidden library. He sees a scroll with '語るべからず' written in ink. He realizes he must stay silent forever.
Word Web
Challenge
Find a historical sign in a Japanese movie or drama and identify the verb used with べからず.
Cultural Notes
Signs at temples often use this to maintain a sacred atmosphere.
Characters use this to sound like feudal lords or samurai.
Used in very old legal documents to state absolute prohibitions.
Derived from the classical auxiliary verb 'beshi' (obligation) + 'zu' (negative).
Conversation Starters
What does '入るべからず' mean on a sign?
When would you see 'べからず' used today?
How does 'べからず' differ from '禁止'?
Can you create a sentence using 'べからず' for a historical setting?
Journal Prompts
Common Mistakes
Test Yourself
芝生に___べからず。
Which is correct?
Find and fix the mistake:
食べるべからずです。
入ってはいけません。
べからず is used in casual conversation.
Sign: 騒ぐべからず。 Student: ___.
べからず / 芝生 / 入る / に
Sort: べからず, 禁止, ちゃだめ
Score: /8
Practice Exercises
8 exercises芝生に___べからず。
Which is correct?
Find and fix the mistake:
食べるべからずです。
入ってはいけません。
べからず is used in casual conversation.
Sign: 騒ぐべからず。 Student: ___.
べからず / 芝生 / 入る / に
Sort: べからず, 禁止, ちゃだめ
Score: /8
Practice Bank
14 exercises初心 ___ べからず。
私のケーキを食べるべからずです。
者 / 食う / 働かざる / べからず
Do not look at your smartphone.
Choose the sentence you'd most likely see on a warning sign:
Match the pairs:
この禁術を ___ べからず。
決して諦めるなべからず。
に / ゴミを / ここ / 捨てる / べからず
Thou shalt not lie.
Select the WRONG usage:
Match the pairs:
約束を ___ べからず。
以外 / 関係者 / 入る / べからず
Score: /14
FAQ (8)
No, it is too archaic and sounds like a command. Use '〜てはいけません' or '〜禁止' instead.
It is an auxiliary verb that attaches to other verbs.
It sounds authoritative and traditional, which fits the atmosphere of temples and historical sites.
No, it is a fixed form.
禁止 is a noun label; べからず is a verbal command.
Yes, as long as it is in the dictionary form.
It is not rude, but it is very strict and formal.
It comes from the classical Japanese auxiliary 'beshi'.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
No debe
べからず is archaic/literary, while 'no debe' is standard.
Il est interdit de
べからず is a verbal suffix, not a noun-based phrase.
Verboten
べからず is a command, 'verboten' is a status.
禁止
べからず is a verb-based construction.
لا يجب
べからず is strictly for prohibitions.
〜てはいけない
Register and historical weight.
Learning Path
Prerequisites
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