22 Japanese ways to say “That’s unbelievable”

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Finding the perfect expression can be a game changer, especially when you want to show genuine surprise in Japanese.

Whether something is shocking, hard to believe, or just downright amazing, there’s a phrase for every shade of surprise.

In this list, you’ll discover 22 warm, relatable ways to say “That’s unbelievable” in Japanese.

Each phrase comes with pronunciation guides and little tips to help you sound more natural, whether you’re chatting with friends or impressing someone new.

Learning these expressions will not only boost your language skills but also deepen your cultural understanding.

Let’s dive in and explore some fantastic, easy-to-use Japanese phrases that capture that “Wow, no way!” feeling perfectly.

Everyday Surprises

These expressions are great for casual conversations when you want to express disbelief or amazement.

They’re simple to remember and perfect for sounding natural among friends or in informal settings.

Each one comes with a quick tip to help you use it confidently.

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If you want to start from scratch, consider using a beginner phrasebook to get familiar with the basics.

These phrases will help you react naturally when something catches you off guard.

Try them out, and watch your conversations become more lively and expressive.

Part 1: Casual Suggestions

1. 信じられない！ (Shinjirarenai!) – “Unbelievable!”

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This is the classic way to say “That’s unbelievable!” in Japanese.

It literally means “can’t believe” – from 信じる (shinjiru) “to believe” plus られない (rarenai), a negative potential form meaning “cannot.”

It’s short, punchy, and perfect for moments of genuine shock or surprise.

Because it’s so common, you’ll hear it everywhere, so it’s great to add to your go-to phrases.

For example, if a friend tells you something crazy, just say “信じられない！” to show your amazement.

Use it often, and soon it’ll feel as natural as saying “No way!” in English.

2. まさか！ (Masaka!) – “No way!” / “Impossible!”

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“まさか” is a versatile exclamation meaning “No way!” or “It can’t be!”

It’s often used when you hear something unexpected and hard to believe.

It’s short and informal, so perfect for casual conversations.

Just be careful not to overuse it in formal settings because it’s quite colloquial.

For example, if someone says they won the lottery, you can respond with “まさか！” to express your surprise.

It works wonderfully as a quick reaction to surprising news.

3. 嘘でしょ？ (Uso desho?) – “You’re kidding, right?”

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Literally “嘘 (uso)” means “lie,” and “でしょ” softens it to “right?” or “isn’t it?”

This phrase is perfect for reacting to shocking or hard-to-believe news with a friendly tone.

It’s informal and used mostly with friends or close acquaintances.

It’s a great way to show you’re surprised but also a bit skeptical.

Example: If a friend says they climbed Mount Fuji overnight, you can say “嘘でしょ？” to playfully question them.

It adds personality and warmth to your surprise reactions.

4. ありえない！ (Arienai!) – “No way!” / “Impossible!”

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“ありえない” comes from ありえる (arieru) meaning “to be possible,” plus ない (nai) meaning “not.”

It’s a casual way to say “That’s impossible!” or “No way!”

It’s very useful when something just can’t be true from your point of view.

Because it’s strong, use it with people you know well to avoid sounding rude.

For example, if someone tells you they saw a UFO, “ありえない！” fits perfectly.

It’s a fun, expressive phrase to add to your surprise toolkit.

5. 信じられないくらい！ (Shinjirarenai kurai!) – “Unbelievably…”

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This phrase is a bit longer and means “To an unbelievable degree.”

“くらい” (kurai) means “about” or “degree,” so it intensifies the disbelief.

It’s perfect when you want to express that something is beyond belief.

It can be used in both casual and semi-formal contexts.

For example, “信じられないくらい美味しい！” means “Unbelievably delicious!”

Try using it to emphasize your surprise in a positive or negative way.

6. 何それ！ (Nani sore!) – “What’s that?!”

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“何” (nani) means “what” and “それ” (sore) means “that.”

It’s a quick, informal way to react with disbelief or shock.

It’s often used when something sounds so strange or unbelievable that you need clarification.

It’s casual and perfect for everyday conversations.

If someone tells you something bizarre, just say “何それ！” to show your surprise.

It’s short, snappy, and easy to remember.

7. マジで？ (Maji de?) – “Seriously?”

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“マジ” (maji) is slang for “serious” or “really,” and “で” (de) is a particle here meaning “is it?”

This phrase is super casual and common among young people.

It’s a great way to express disbelief but with a friendly tone.

Use it when you want to question something surprising but not necessarily negative.

For example, if a friend tells you they got a new job, “マジで？” shows your amazed interest.

It’s short and easy to slip into daily chats.

8. うそ！ (Uso!) – “No way!” / “You’re kidding!”

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“うそ” literally means “lie,” but as an exclamation, it means “No way!” or “You’re kidding!”

It’s informal and super common in everyday speech.

It’s perfect for quick, surprised reactions.

Try saying “うそ！” when someone tells you exciting or unbelievable news.

It’s a versatile expression that really brings out your personality.

Just be careful not to use it in very formal situations.

Part 2: Polite & Formal Suggestions

9. 驚きました！ (Odorokimashita!) – “I was surprised!”

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This is a polite and respectful way to express that you were surprised.

It comes from 驚く (odoroku) meaning “to be surprised” plus the polite past form ました (mashita).

It’s great for formal conversations or business settings.

Using it shows you’re impressed or taken aback in a respectful way.

For example, after a presentation, you can say “驚きました！” to show your admiration.

Perfect for maintaining professionalism while expressing genuine feelings.

10. それは信じがたいです。 (Sore wa shinjigatai desu.) – “That’s hard to believe.”

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This phrase means “That’s hard to believe” and is quite formal.

“信じがたい” (shinjigatai) combines 信じる (to believe) with がたい, a suffix meaning “difficult to.”

It’s perfect when you want to express disbelief politely.

Use it in situations that require respect or in written communication.

Example: When reviewing unexpected reports, “それは信じがたいです” fits well.

It’s a sophisticated way to express surprise.

11. 本当に驚きました。 (Hontō ni odorokimashita.) – “I was truly surprised.”

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“本当に” (hontō ni) means “really” or “truly,” adding emphasis to the polite “驚きました.”

It’s useful in formal conversations to express sincere amazement.

It sounds warm and respectful at the same time.

Try it when you want to convey heartfelt surprise in polite company.

For example, at a ceremony, you might say “本当に驚きました。”

It’s a classy, heartfelt expression.

12. それは信じられません。 (Sore wa shinjiraremasen.) – “I can’t believe that.”

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This is a formal way to say “I can’t believe that.”

It uses the potential negative form of 信じる (to believe), making it polite and clear.

It’s great for business or formal social situations.

Use it when you want to express strong disbelief respectfully.

Example: Hearing unexpected news in a meeting, “それは信じられません” fits well.

It shows politeness and seriousness.

13. まったく信じられません。 (Mattaku shinjiraremasen.) – “I absolutely can’t believe it.”

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“まったく” means “completely” or “absolutely,” enhancing the disbelief.

Pairing it with “信じられません” makes the phrase very emphatic and polite.

It’s suitable for formal speech or writing when you want to stress disbelief.

Use it when something is truly shocking and hard to accept.

For example, “まったく信じられません” during a serious discussion.

It’s a powerful, respectful way to express surprise.

14. それは驚異的ですね。 (Sore wa kyōiteki desu ne.) – “That’s astonishing.”

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“驚異的” (kyōiteki) means “astonishing” or “amazing.”

This phrase is polite and often used to express amazement in a respectful manner.

It’s great for formal compliments or professional praise.

Try it when you want to sound impressed but polite.

Example: After seeing a great presentation, say “それは驚異的ですね。”

It’s elegant and positive.

15. そんなことは信じられません。 (Sonna koto wa shinjiraremasen.) – “I can’t believe such a thing.”

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This phrase literally means “I cannot believe such a thing.”

It’s formal, respectful, and expresses disbelief clearly.

Useful in serious conversations or when discussing shocking facts.

Use it to express your doubt politely and firmly.

For example, “そんなことは信じられません” if you hear a surprising rumor.

It’s both clear and polite.

16. まさに信じられない出来事です。 (Masani shinjirarenai dekigoto desu.) – “It’s truly an unbelievable event.”

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“まさに” means “exactly” or “truly,” and “出来事” means “event.”

This phrase is perfect for formal commentary on surprising events.

It sounds respectful and sincere.

Use it to describe something truly remarkable or unbelievable in polite speech.

For example, at a conference, “まさに信じられない出来事です” fits well.

It elevates your reaction with grace.

Part 3: Very Casual / Native-like Expressions

17. えー！？マジで！？ (Eee!? Maji de!?) – “What!? Seriously!?”

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This is a super casual, emphatic way to express surprise among friends.

“えー！？” is a drawn-out “Eh!?” showing shock, and “マジで！？” means “Seriously!?”

It’s lively and common among younger people.

It’s perfect when something really blows your mind.

Example: Hearing unbelievable gossip, you might say “えー！？マジで！？”

It’s fun and full of energy.

18. ありえへん！ (Ariehen!) – Kansai Dialect for “No way!”

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This is the Kansai dialect (Osaka area) version of ありえない (arienai).

It means “No way!” or “Impossible!” with a friendly, casual tone.

Using dialect expressions can make you sound more native-like and approachable.

Use it with friends or when you want a fun regional twist.

Example: “ありえへん！” after hearing a crazy story.

It’s playful and expressive.

19. なんてこった！ (Nante kotta!) – “What the heck!”

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“なんてこった” is a casual exclamation meaning “What the heck!” or “Oh my gosh!”

It’s often used when something unbelievable or frustrating happens.

It adds a dramatic flair to your surprise.

Use it when you want to sound expressive and natural.

Example: After missing a train, you might say “なんてこった！”

It’s vivid and memorable.

20. ガチで！？ (Gachi de!?) – “For real!?”

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“ガチ” (gachi) means “serious” or “real,” often used in slang.

Paired with “で！？”, it forms a surprised question: “For real!?”

It’s casual and popular among younger Japanese.

Use it when you want to show disbelief but keep it light.

Example: “ガチで！？” if someone tells you unbelievable news.

It’s punchy and fun.

21. ありえん！ (Arien!) – Informal, shortened version of “ありえない”

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Simply a shortened, more casual form of “ありえない.”

It’s very informal and used among close friends.

It’s quick and easy to say when something seems impossible.

Example: After hearing a wild excuse, “ありえん！” fits perfectly.

It’s slangy and expressive.

Great for casual chats and texts.

22. うそやん！ (Uso yan!) – Kansai Dialect for “You’re kidding!”

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This is the Kansai dialect way to say “You’re kidding!”

“うそ” means “lie,” and “やん” is a Kansai dialect sentence-ending particle.

It’s casual, friendly, and full of local charm.

Use it to add regional flavor to your speech.

Example: “うそやん！” after hearing surprising news from a Kansai friend.

It’s playful and very natural sounding.

Concluding Thought

Exploring these 22 ways to say “That’s unbelievable” in Japanese opens up a world of expression beyond the basic phrases.

From casual slang to polite formalities and even regional dialects, each phrase lets you connect with people in a more authentic, relatable way.

Keep practicing, and soon you’ll be reacting like a native to every surprising moment life throws your way!