“〜hazu ga nai noni・〜nai hazu nanoni”: It Shouldn't Be, Yet [JLPT N1]
By Nihongo to Japan · Updated July 3, 2026
Strong bewilderment when something logically impossible nonetheless happens.
“〜hazu ga nai noni・〜nai hazu nanoni”: It Shouldn't Be, Yet
This pair means “by rights it should(n't) 〜, yet (reality is the opposite)” — a gap between logical inference and reality, with surprise, bewilderment (adversative). ① 〜はずがないのに = ‘even though it's impossible to 〜, yet …': 「あんなに練習したのだから、負けるはずがないのに(不安だ)」 (having practiced so much, there's no way I'd lose, yet (I'm anxious)); ② 〜ないはずなのに = ‘by rights it shouldn't 〜, yet …': 「知っているはずなのに、黙っている」 (by rights they should know, yet they stay silent), 「来るはずがないのに、つい待ってしまう」 (there's no way they'd come, yet I find myself waiting). ⚠️ The latter is a fact contrary to the inference, with a ‘it shouldn't be, yet …' bewilderment. ⚠️ 「はず」 expresses ‘should, by inference,' 「のに」 is adversative.
🧠 Core nuance: by reason it should(n't) be so, yet reality is opposite
The core is a gap between logical/common-sense inference and reality (with surprise, bewilderment): 「はず」 expresses ‘should, by inference,' and with 「のに (yet)」 forms an adversative, meaning ‘by reason it should(n't) …, yet reality is the opposite.' ① はずがないのに — ‘even though it's impossible …, yet …' (inference: it can't be so → reality is so: 負けるはずがないのに不安 = no way I'd lose yet anxious, 来るはずがないのに待つ = no way they'd come yet waiting); ② ないはずなのに — ‘by rights it shouldn't …, yet …' (知らないはずなのに知っている = by rights they shouldn't know yet they do). It carries a ‘illogical, can't figure it out, unexpected' bewilderment. ⚠️ The latter is often a reality contradicting the inference or one's own contradictory behavior (knowing it's impossible yet still …). ⚠️ Connection: verb/adjective plain form ＋ はずがないのに/はずなのに (noun ＋ の/な-adj ＋ な ＋ はず).
📌 How to Connect
| Form | Use | Example |
|---|---|---|
| 〜はずがないのに | even though impossible 〜, yet | 負けるはずがないのに |
| 〜ないはずなのに | by rights shouldn't 〜, yet | 来ないはずなのに |
| 〜はずなのに | by rights should 〜, yet | 知っているはずなのに |
💬 Example Sentences
- あんなに練習したのだから、負けるはずがないのに、なぜか不安だ。(Having practiced so much, there's no way I'd lose, yet somehow I'm anxious.) — conflicted feeling
- 彼はもう来るはずがないのに、つい玄関を見てしまう。(There's no way he'd come now, yet I find myself glancing at the entrance.) — contradictory behavior
- この時間なら、まだ寝ているはずなのに、電気がついている。(At this hour they should still be asleep, yet the light is on.) — surprise
- 答えを知っているはずなのに、彼はずっと黙っている。(By rights he should know the answer, yet he stays silent.) — bewilderment
- 鍵をかけたはずなのに、ドアが開いていた。(I should have locked it, yet the door was open.) — can't figure it out
🔄 Compare: はずがないのに vs はずなのに vs わけがない vs にもかかわらず
| Expression | Nuance | Example |
|---|---|---|
| 〜はずがないのに | “even though impossible 〜, yet” (negated inference + adversative, bewilderment) | 負けるはずがないのに |
| 〜はずなのに | “by rights should 〜, yet” (inference + adversative) | 知っているはずなのに |
| 〜わけがない | “impossible to 〜” (strong negated inference, no のに) | 勝てるわけがない |
| 〜にもかかわらず | “despite 〜, yet” (adversative, objective) | 努力したにもかかわらず |
⚠️ Common Mistakes
- Latter contrary to the inference: はずがないのに is followed by a reality contradicting the inference or one's own contradictory behavior (impossible yet …, shouldn't yet …).
- Carries bewilderment/surprise: this pair carries a ‘can't figure it out, unexpected' bewilderment, not a simple negation.
- Distinguish from わけがない: わけがない = simply a negated inference (impossible); はずがないのに = inference + adversative gap (with bewilderment).
- Connection: plain form ＋ はずがないのに/はずなのに (noun の/な-adj な ＋ はず).
💡 Nuance & When to Use
「はずがないのに・ないはずなのに」 mean “by rights it should(n't) 〜, yet (reality is the opposite),” a gap between logical inference and reality, with surprise, bewilderment (負けるはずがないのに不安, 来るはずがないのに待つ, 知っているはずなのに黙っている). 「はず」 expresses ‘should, by inference,' 「のに」 is adversative. The latter is a fact contrary to the inference or one's own contradictory behavior. ⚠️ Distinguish from the simple negated inference 「わけがない」 and the objective adversative 「にもかかわらず」. A must at N1.
🎯 JLPT Exam Tips
- High-frequency N1: 〜はずがないのに/ないはずなのに = by rights it should(n't) 〜, yet (a gap between inference and reality, with surprise, bewilderment).
- Core distinction: はずがないのに (inference + adversative, bewilderment) vs わけがない (simply a strong negated inference, no gap).
- Latter: a fact contrary to the inference or one's own contradictory behavior; carries ‘can't figure it out, unexpected.'
🖊️ Practice Quiz
Q1. 「あんなに練習したのだから、負ける___。」(there's no way I'd lose, yet …)
(A) はずがないのに (B) に違いない (C) おそれがある (D) かもしれない
Q2. What does 「ないはずなのに」 mean?
(A) by reason it shouldn't be so, yet (adversative)
(B) it definitely will
(C) no adversative
(D) a command
Q3. What does 「来るはずがないのに待つ」 mean?
(A) waiting even though there's no way he'd come
(B) he'll definitely come
(C) not waiting for him
(D) he came
Q4. What is the latter clause of 「はずがないのに」?
(A) a fact contrary to the inference (with surprise/doubt)
(B) a command
(C) pure time
(D) a wish
Q5. Which connection is correct?
(A) 知っているはずなのに、黙っている。
(B) 知るはずがないのにを。
(C) 知っていはずなのに。
(D) 知るはずがないのにだ。
Answer Key
1. (A) はずがないのに ── there's no way I'd lose, yet (feeling uneasy).
2. (A) ── by reason it shouldn't be so, yet (adversative).
3. (A) ── waiting even though there's no way he'd come.
4. (A) ── a fact contrary to the inference (with surprise/doubt).
5. (A) 知っているはずなのに、黙っている ── should know, yet stays silent (correct connection).