“〜to omoikiya”: I Thought 〜, but Unexpectedly… (a surprising reversal) [JLPT N1]
By Nihongo to Japan · Updated July 3, 2026
An unexpected result that's the complete opposite of what was anticipated
“〜to omoikiya”: I Thought 〜, but Unexpectedly…
「plain form ＋ と思いきや」 means “I thought it would be A, but unexpectedly it was B” — the first part is the expectation, the latter an unexpected fact contrary to it. E.g. 「空は晴れると思いきや、急に大雨になった」 (I thought it would clear up, but suddenly it poured). It carries a playful sense of surprise and reversal, common for narrating unexpected twists.
🧠 Core nuance: the expectation falls through, reality flips it
The core is the contrast of expectation vs surprise: the speaker expected A, but reality turned out the opposite (B), with an “huh? didn't see that coming!” surprise. 思いきや is the literary “思ったところが” (just when I thought). The tone is lively and a bit tongue-in-cheek, filling narration with the fun of twists — common in novels, essays, and spoken storytelling.
📌 How to Connect
| Form | Pattern | Example |
|---|---|---|
| plain form ＋ と思いきや | verb/adj/noun plain form ＋ と思いきや | 勝てると思いきや |
| noun/な-adj ＋ (だ)と思いきや | 楽勝だと思いきや | 楽勝と思いきや |
| latter part | an unexpected fact | 〜と思いきや、〜だった |
💬 Example Sentences
- 空は晴れると思いきや、急に大雨になった。(I thought it would clear up, but it suddenly poured.) — weather reversal
- 簡単に勝てると思いきや、苦戦した。(I thought I'd win easily, but I struggled.) — expectation dashed
- 怒られると思いきや、逆に褒められた。(I thought I'd be scolded, but instead got praised.) — reversal
- 高い店だと思いきや、意外と安かった。(I thought it'd be a pricey place, but it was surprisingly cheap.) — noun connection
- もう寝たと思いきや、まだ起きていた。(I thought they'd gone to bed, but they were still up.) — surprise
🔄 Compare: と思いきや vs かと思うと vs に反して vs はずだったが
| Expression | Nuance | Example |
|---|---|---|
| 〜と思いきや | “thought 〜, but surprisingly” (playful reversal) | 勝てると思いきや負けた |
| 〜かと思うと | “just when I thought 〜” (sudden change) | 泣いたかと思うと笑った |
| 〜に反して | “contrary to 〜” (written, objective) | 予想に反して |
| 〜はずだったが | “was supposed to 〜, but” (a foiled plan) | 行くはずだったが |
⚠️ Common Mistakes
- Dropping と: ✗ 楽勝思いきや → ✓ 楽勝(だ)と思いきや (と is required).
- Following it with a command/volition: と思いきや is followed by an unexpected fact that already happened, not a command or volition.
- Front-back consistency: the latter part must be opposite to the expectation (thought clear → but rained), not the same.
- Noun connection: nouns/な-adjectives can take だ (楽勝だと思いきや) or attach directly (楽勝と思いきや).
💡 Nuance & When to Use
と思いきや expresses “I thought 〜, but unexpectedly…,” full of the fun of a surprising reversal, common for narrating twists (thought I'd win but lost, thought I'd be scolded but praised). Its lively, slightly playful tone is common in novels, essays, and spoken stories. It has more of an “huh? surprise!” delight than the objective に反して. Master its reversal feel for livelier, more entertaining narration. A must at N1.
🎯 JLPT Exam Tips
- High-frequency N1: plain form ＋ と思いきや = thought 〜, but unexpectedly… (surprising reversal).
- Connection: plain form ＋ と思いきや; nouns can take だ or attach directly.
- Nuance: the latter part is an unexpected fact contrary to the expectation; not a command/volition.
🖊️ 練習題（5題）
Q1. 「空は晴れる___、急に大雨になった。」（以為會晴，沒想到）
(A) と思いきや (B) と思うと (C) と思えば (D) と思って
Q2. 「と思いきや」の前項と後項の関係は?
(A) 原本的預期 vs 出乎意料的事實
(B) 完全一致
(C) 因果
(D) 並列
Q3. 「勝てると思いきや苦戦した」の意味は?
(A) 以為能贏，沒想到陷入苦戰
(B) 輕鬆獲勝
(C) 一定會輸
(D) 沒有比賽
Q4. 「と思いきや」の語感は?
(A) 以為〜沒想到（意外反差，帶趣味）
(B) 客觀陳述
(C) 命令
(D) 純條件
Q5. 接法が正しいのは?
(A) 楽勝だと思いきや、負けた。 (B) 楽勝と思いきやを。
(C) 楽勝と思いきやに行く。 (D) 楽勝思いきや(と が必要)。
答案解析
1. (A) と思いきや ── 以為會晴沒想到大雨。
2. (A) ── 原本預期 vs 出乎意料的事實。
3. (A) ── 以為能贏沒想到苦戰。
4. (A) ── 以為〜沒想到(意外反差)。
5. (A) ── 「楽勝だと思いきや、負けた」正確。