How to Say "No Way" in Japanese Slang: ありえない and 無理
Learn two common Japanese slang phrases for disbelief: ありえない and 無理. Understand their tones, when to use them, and practice with a natural dialogue.
By PookieFriends & plans · Yapr Learn
When you want to express disbelief or say "no way" in casual Japanese, two slang phrases are especially common: ありえない (arienai) and 無理 (muri). This lesson teaches you what they mean, how they differ in tone, and how to use them naturally in everyday conversation. You'll also learn a few related expressions and practice with a realistic dialogue.
By the end, you can…
- use ありえない and 無理 to express disbelief or rejection in casual Japanese.
- distinguish the nuance between ありえない and 無理 and choose the right one for the situation.
Listen once. Try it slowly. Then say it without looking.
Checking available voices…
ありえない
No way; impossible; unbelievable
a-ri-e-na-i
Used when something is so surprising or unacceptable that it seems impossible. Often expresses shock or disapproval.
無理
No way; impossible; can't do it
mu-ri
Can mean "impossible" in a practical sense, or as slang, it expresses that something is too difficult or unacceptable. Often used to reject a request or idea.
ありえないでしょ
That's impossible, right?; No way, right?
a-ri-e-na-i de-sho
Adds でしょ to seek agreement or emphasize disbelief. Very casual.
無理無理
No way, no way; Absolutely impossible
mu-ri mu-ri
Repeating 無理 adds emphasis and a sense of urgency or strong rejection. Common in casual speech.
それは無理
That's impossible; I can't do that
so-re wa mu-ri
A slightly more explicit way to say something is impossible or that you can't comply. Still casual but can be used in polite company with a softer tone.
Pronunciation guides are approximate. Slow playback keeps the original pitch.
Make it make sense
Useful pattern
ありえない literally means "cannot exist" and is used when something is beyond belief or unacceptable. For example, if a friend says they saw a celebrity in a tiny town, you might reply ありえない！ (No way!). 無理 can mean unreasonable or impossible; in this context it says something is not feasible or you cannot do it. For example, if someone asks you to finish a huge task in one hour, you can say 無理。 (No way / I can't). Both are casual and common in everyday speech.
When to use it
Use ありえない when you want to express shock, disbelief, or that something is unacceptable. It often carries a tone of "I can't believe that!" Use 無理 when you want to say that something is impossible for you to do, or to reject a suggestion firmly. For example, if a friend invites you to a party but you have too much homework, you can say 今日は無理。 (Today is impossible / I can't today). If you hear gossip that seems too crazy, ありえない！ is natural. Both are informal; avoid them in formal situations unless you soften your tone.
Listen to each line, then take one part and reply out loud.
ねえ、聞いて。田中さんが会社を辞めて、芸能人になるんだって。
Hey, listen. I heard Tanaka-san is quitting the company to become a celebrity.nee, ki-i-te. ta-na-ka-san ga ka-i-sha o ya-me-te, ge-i-no-o-jin ni na-ru-n da-tte.え、ありえない！ そんなの信じられない。
What, no way! I can't believe that.e, a-ri-e-na-i! son-na no shin-ji-ra-re-na-i.でも、本当らしいよ。来月から東京でレッスンを受けるって。
But it seems to be true. Apparently he'll start taking lessons in Tokyo next month.de-mo, hon-tou ra-shi-i yo. ra-i-ge-tsu ka-ra tou-kyou de re-ssun o u-ke-ru tte.へえ、すごいね。でも、私には無理だな。
Wow, that's amazing. But for me, it would be impossible.hee, su-go-i ne. de-mo, wa-ta-shi ni wa mu-ri da na.A little context goes a long way
ありえない and 無理 are both casual and can sound blunt. In formal situations, use softer expressions like それは難しいですね (That would be difficult) or 信じられません (I can't believe it). Among friends, the slang usage is fine and common. Note that 無理 can also mean "impossible" in a neutral sense, so context and tone matter.
One thing to watch for
Using ありえない to mean "I can't do it" when asked to do a task.
Try this instead: Use 無理 for personal impossibility. For example, if asked to lift something heavy, say 無理。 (I can't). ありえない would mean "that's unbelievable" and sound odd.
Your turn
Try answering out loud before checking a possible answer.
1Your friend tells you they won the lottery twice in one week. What slang phrase might you use to express disbelief?
Show a sample answer
ありえない！
ありえない expresses shock and disbelief at something that seems impossible. 無理 could also be used, but ありえない is more natural for pure disbelief.
2You are asked to work overtime for the fifth day in a row. You want to say "No way" firmly. Which phrase is appropriate?
Show a sample answer
無理。
無理 is used to reject something as impossible for you. ありえない would express disbelief but not personal refusal.
3How would you say "That's impossible, right?" in a casual way to seek agreement?
Show a sample answer
ありえないでしょ？
Adding でしょ to ありえない seeks agreement or confirmation. 無理でしょ is also possible but means "It's impossible, right?" in a different nuance.
Use ありえない for disbelief and 無理 for personal impossibility or rejection. Both are casual; use softer alternatives in formal settings.
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