Expressing Prohibition in Japanese
If you’re learning Japanese, mastering how to express prohibition (saying what cannot or should not be done) is an essential step toward fluency. Japanese has a rich tapestry of expressions for prohibition, each carrying different nuances based on politeness levels, context, and the strength of the prohibition. In this blog, I’ll guide you through the most common ways to express prohibition in Japanese and help you understand when to use them.
1. ～てはいけません (Te wa ikemasen)
This is one of the most commonly used and polite ways to express prohibition in Japanese. It translates roughly to “You must not…” or “It’s not allowed to…”.
Formation:
Take the te-form of the verb and attach ～てはいけません.
Example:
- ここでたばこを吸ってはいけません。
(Koko de tabako o sutte wa ikemasen.)
“You must not smoke here.”
This phrase is often used in formal situations, such as school rules, workplace guidelines, or signs in public spaces.
2. ～ちゃダメ / ～ちゃいけない (Casual Forms)
In casual settings, Japanese speakers often use ～ちゃダメ or ～ちゃいけない to express prohibition. These are informal contractions of ～てはいけません.
Example:
- ここでゲームしちゃダメだよ。
(Koko de geemu shicha dame da yo.)
“You can’t play games here.” - あそこで走っちゃいけない。
(Asoko de hashiccha ikenai.)
“You must not run over there.”
Use these with close friends, family members, or peers, but avoid them in formal contexts.
3. 禁止 (Kinshi) – The Formal, Written Prohibition
When expressing prohibition in written form, especially on signs or official notices, the word 禁止 (kinshi, meaning “prohibited”) is frequently used.
Example:
- 飲酒禁止 (Inshu kinshi)
“Drinking alcohol is prohibited.” - 駐車禁止 (Chuusha kinshi)
“No parking.”
This construction is direct and impersonal, commonly used in public spaces to state clear rules.
4. ～てはならない (Te wa naranai)
This is a more formal and literary way of expressing prohibition. It is less common in daily conversation but can be seen in legal documents or formal writings.
Example:
- 嘘をついてはならない。
(Uso o tsuite wa naranai.)
“You must not tell lies.”
5. Use of だめ (Dame)
The word だめ (dame) itself means “no good,” “not allowed,” or “forbidden.” It’s highly versatile and can stand alone as an expression of prohibition.
Examples:
- それはだめです。 (Sore wa dame desu.)
“That’s not allowed.” - 今はだめ。 (Ima wa dame.)
“Not now.”
Depending on the tone and situation, だめ can range from strict to soft and conversational.
6. ～べからず (Bekarazu) – Traditional and Strict
This archaic phrase is rarely used in modern conversation but appears in traditional, formal, or poetic contexts.
Example:
- 立ち入りべからず。
(Tachiiri bekarazu.)
“No trespassing.”
It carries an old-fashioned and authoritative tone, reminiscent of samurai-era language.
Choosing the Right Expression
When deciding how to express prohibition in Japanese, consider the following factors:
- Formality: Use ～てはいけません for polite conversations and signs, and ～ちゃダメ for casual settings.
- Authority: Use 禁止 or ～てはならない for official or serious prohibitions.
- Audience: Adapt your language based on whether you’re speaking to a friend, a stranger, or a group.
Practice Makes Perfect!
Understanding prohibition in Japanese is only the first step; using it naturally requires practice. Try creating your own sentences using these structures, and pay attention to how native speakers use them in real life. The more you immerse yourself, the more intuitive these expressions will become.
So, what are you waiting for? Share your practice sentences in the comments, and let’s refine your skills together!
あなたはどの禁止表現をよく使いますか？コメントで教えてください！
(Anata wa dono kinshi hyougen o yoku tsukaimasu ka? Komento de oshiete kudasai!)
Which prohibition expression do you use most often? Let me know in the comments!
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Happy learning! 😊
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Vikas Kumar is a multilingual educator, language specialist, and book author, and the founder of My Language Classes, an independent language learning platform dedicated to structured, clarity-driven language education.
With over eight years of professional experience working with languages, Vikas has taught and supported learners across English, Spanish, and Japanese, helping them build strong grammatical foundations, practical usage skills, and long-term accuracy. His work focuses on eliminating confusion in language learning by emphasizing structure, patterns, and real usage over rote memorization.
Vikas has worked as a Japanese language expert with multiple multinational organizations, supporting cross-border communication, translation, and language-driven operations in professional environments. Alongside his corporate experience, he has spent several years teaching Japanese and Spanish independently, designing lessons tailored to academic goals, professional needs, and exam preparation.
As an author, Vikas writes structured language learning books that focus on grammar mastery, clarity of usage, and exam-oriented accuracy. His published works include guides on English tenses, verb types, and prepositions, as well as Spanish learning resources aligned with DELE A1 preparation. His books are designed for self-learners, educators, and serious students who want depth, not shortcuts.
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