22 Japanese ways to say “That’s impossible”
Ever found yourself stuck trying to say “That’s impossible” in Japanese? Whether you’re chatting with friends or expressing disbelief, there are so many ways to say it that fit different moods and levels of formality.
From casual slang to polite expressions, this list covers a wide range of phrases so you can sound natural and confident in any situation.
Learning these variations not only boosts your vocabulary but also helps you understand Japanese culture and nuance better.
Get ready to explore 22 warm, relatable, and easy-to-remember Japanese ways to say “That’s impossible.” You’ll be amazed at how versatile the language can be!
Plus, these phrases can come in handy whether you’re traveling, studying, or just having fun with Japanese.
Let’s dive in and find the perfect “impossible” phrase for every occasion.
Understanding the Basics of Saying “Impossible” in Japanese
Before we jump into the different expressions, it helps to know the core word for impossible: 無理 (むり, muri) — pronounced “moo-ree.” It literally means “unreasonable” or “impossible.”
Many phrases use 無理 as a base, but the magic is in how you combine it with other words or adjust the tone.
By mixing and matching, you can sound casual, polite, dramatic, or even humorous.
Sometimes, a simple Japanese language learning book can give you a solid foundation on these basics.
Once you know 無理, the rest is about context and creativity.
Let’s break these 22 phrases into three groups: casual, polite/formal, and very casual/native-like expressions.
Part 1: Casual Suggestions
1. 無理だよ (Muri da yo) – “That’s impossible.”
This is the most straightforward and common way to say “That’s impossible” in casual speech.
無理 (muri) means impossible, and だよ (da yo) adds emphasis like “you know” or “I’m telling you.” It’s casual but clear.
Use it with friends or people you’re close to.
It’s simple and gets your point across without being rude.
Related phrases like 無理かも (muri kamo) mean “It might be impossible,” which softens the statement.
Perfect for casual conversations when you want to be direct but friendly.
2. そんなの無理！ (Sonna no muri!) – “That kind of thing is impossible!”
This phrase adds そんなの (sonna no), meaning “that kind of thing,” making it stronger and a bit more emotional.
It’s casual and often used when you’re surprised or frustrated.
Great for informal chats or storytelling.
Just remember it’s more expressive, so use it with people you know well.
You can soften it by adding かも (kamo) to say “Maybe that’s impossible.”
It’s a fun and natural way to show disbelief.
3. 無理っぽい (Muri ppoi) – “Seems impossible.”
Adding っぽい (ppoi) to 無理 makes it “looks impossible” or “seems impossible.”
It’s a casual, slightly less definite way to express doubt.
Use it when you want to sound less harsh or open to possibilities.
It’s great for everyday conversations and when you’re unsure.
Try pairing it with phrases like かもしれない (kamoshirenai) for “might be impossible.”
Easy to use and sounds very natural.
4. 無理だなあ (Muri da naa) – “No way, that’s impossible.”
The なあ (naa) ending adds a tone of reflection or resignation.
It’s casual and often used when you just accept something can’t be done.
Sounds gentle and a bit thoughtful.
Perfect when you want to soften your refusal or disbelief.
Try it when chatting with friends about tough situations.
It’s a nice way to keep things light but clear.
5. 絶対無理 (Zettai muri) – “Absolutely impossible.”
絶対 (zettai) means “absolutely” or “definitely,” so this phrase emphasizes total impossibility.
It’s casual but strong, used when you want to be very clear.
Common in everyday chats or when jokingly exaggerating.
Watch out: it can sound a bit forceful, so tone matters.
Pair with a smile or laugh to keep it friendly.
Use it when you really want to stress that something can’t happen.
6. 無理無理 (Muri muri) – “No way, no way!”
Repeating 無理 adds a fun, emphatic tone like “No way, no way!”
It’s very casual and playful.
Used when rejecting something completely but in a joking manner.
Perfect with friends to lighten the mood.
Great for casual texts or conversations.
Try not to use it in serious situations as it might seem disrespectful.
7. 無理だってば！ (Muri datte ba!) – “I’m telling you, it’s impossible!”
The ってば (tte ba) ending adds a sense of insistence or impatience.
This phrase shows you’re firmly stating something, often when someone doesn’t listen.
It’s casual but can sound a bit strong, so use carefully.
Works well in friendly debates or teasing.
Adding a smile softens the tone.
It’s a natural way to insist on impossibility.
8. 無理だよね (Muri da yo ne) – “It’s impossible, isn’t it?”
The ね (ne) ending invites agreement, turning the phrase into a soft confirmation.
It’s casual and friendly.
Great for sharing your thoughts and seeking empathy.
Helps keep the tone light and inclusive.
Use it when you want to bond over something difficult.
Perfect for conversations with friends or coworkers.
Part 2: Polite & Formal Suggestions
9. 無理です (Muri desu) – “That’s impossible.” (polite)
This is the polite form of 無理だ (muri da), suitable for work or formal settings.
です (desu) adds politeness without changing the meaning.
Use it with strangers, colleagues, or those you want to show respect to.
It’s clear, professional, and widely understood.
Helpful when you want to decline or express impossibility respectfully.
Try it in emails or business conversations.
10. それは難しいです (Sore wa muzukashii desu) – “That’s difficult.”
難しい (muzukashii) means “difficult,” a softer way to say something is impossible.
Adding です (desu) keeps it polite.
This phrase is useful when you want to sound tactful.
Great for professional or delicate situations.
Often used to avoid direct refusal.
Try it when you want to be polite but honest.
11. できません (Dekimasen) – “I can’t do it.”
できません (dekimasen) is the negative form of できる (dekiru), “can do.”
It’s polite and straightforward.
Use it when saying something really can’t be done.
Good for formal or neutral situations.
Softens the impossibility by focusing on ability.
Try it when you want to be clear yet respectful.
12. 不可能です (Fukanou desu) – “It’s impossible.” (formal)
不可能 (fukanou) means “impossible” in a more formal, official sense.
です (desu) keeps it polite.
Ideal for formal writing, presentations, or official statements.
It’s less casual and more precise than 無理.
Use it when talking about facts or rules.
A great phrase for business or academic settings.
13. それは無理かもしれません (Sore wa muri kamoshiremasen) – “That might be impossible.”
Adding かもしれません (kamoshiremasen) means “might” or “maybe.”
This phrase expresses polite uncertainty.
Good for gentle refusals or when you want to leave room for discussion.
It sounds respectful and considerate.
Try it in situations where you don’t want to be too direct.
It’s a versatile and safe phrase to use.
14. 難しいと思います (Muzukashii to omoimasu) – “I think it’s difficult.”
This phrase adds your opinion with 思います (omoimasu) – “I think.”
It softens the impossibility by framing it as a thought.
Excellent for polite conversations and negotiations.
Helps avoid sounding too negative.
Use it to express doubts gently.
It’s a great diplomatic way to say “impossible.”
15. 私には無理です (Watashi ni wa muri desu) – “It’s impossible for me.”
This phrase personalizes impossibility.
私には (watashi ni wa) means “for me,” making it less absolute.
It’s polite and humble.
Good for expressing your limits without offending.
Use it in work or social contexts where you want to be respectful.
It shows self-awareness and politeness.
16. 実現不可能です (Jitsugen fukanou desu) – “It’s unachievable/impossible to realize.”
実現 (jitsugen) means “realization” or “implementation.”
Combined with 不可能 (fukanou), it means “not achievable.”
This phrase is formal and technical.
Useful for professional or engineering contexts.
It’s a precise way to say something can’t be done.
Great for presentations or reports.
Part 3: Very Casual / Native-like Expressions
17. ありえない (Arienai) – “No way!” or “Impossible!”
ありえない literally means “can’t exist” or “impossible.”
It’s casual and very common among young people.
Used to express shock or disbelief dramatically.
Great for informal chats and online conversations.
Be careful using it in formal situations.
It’s fun and expressive, perfect for native-like flair.
18. 無理ゲー (Muri gē) – “Impossible game.”
無理ゲー is slang that combines 無理 (impossible) and ゲーム (game).
It refers to something so hard it’s like an impossible game.
Used mostly among gamers and younger people.
It’s casual, playful, and very native.
Try it to sound trendy and fun.
It’s a great phrase to use when joking about tough challenges.
19. 絶対ムリ (Zettai muri) – “Absolutely no way!”
ムリ (muri) written in katakana adds emphasis and a casual feel.
絶対 (zettai) means “absolutely,” so this phrase is a strong refusal.
Common among young people for dramatic effect.
Good for casual conversations or social media.
Use it when you want to be emphatic but informal.
It adds a punch to your expression of impossibility.
20. 無理っす (Muri ssu) – Casual, masculine “Impossible.”
っす (ssu) is a casual, masculine contraction of です (desu).
無理っす makes the phrase sound relaxed and informal.
Used by young men and friends.
Great for casual chat or texting.
Use carefully as it’s quite informal.
It’s a cool, easygoing way to say impossible.
21. できっこない (Dekikkonai) – “Can’t possibly do it.”
できっこない is a very casual, emphatic way of saying “can’t do.”
It’s stronger than できない (dekinai) and often emotional.
Used in spoken Japanese to express strong doubt.
Great for native-like, informal conversations.
Try it when you want to sound natural and expressive.
It’s a fun phrase to add personality to your Japanese.
22. 無理に決まってる (Muri ni kimatteru) – “It’s definitely impossible.”
決まってる (kimatteru) means “it’s decided” or “definitely.”
Adding 無理に (muri ni) makes it “definitely impossible.”
It’s casual and confident.
Used when you want to firmly assert impossibility.
Great for casual talks or friendly debates.
It’s a natural, native-like way to be emphatic.
Concluding Thought
Exploring these 22 Japanese ways to say “That’s impossible” shows how rich and nuanced the language can be.
From polite forms to playful slang, you have plenty of options to express yourself naturally and warmly.
So next time something feels impossible, you’ll have the perfect phrase ready to go—just like a native!
