“〜to omoikiya”: I Thought 〜, but Unexpectedly… (a surprising reversal) [JLPT N1]

Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026

An unexpected result that's the complete opposite of what was anticipated

「失敗すると思いきや」 — you'd think ～, but unexpectedly ～

The most dramatic moments in life are often that flash of “huh? not what I expected.” Japanese has a pattern made for that reversal, 「と思いきや」 — 「失敗すると思いきや、意外にも成功した (you'd think it would fail, but unexpectedly it succeeded).」 「〜と思いきや」 = you'd expect A, but the result is unexpectedly B. Its front is an expectation, its back a fact contrary to it, with the delight of surprise and reversal; this guide also distinguishes the near-synonyms 〈かと思ったら〉〈に反して〉.

Core: you'd think A, but (unexpectedly) B

「(plain form) ＋ と思いきや」 = you'd expect A, but the result is unexpectedly B (a fact contrary to expectation):

• 空は晴れると思いきや、急に大雨になった (you'd think it would clear up, but out of nowhere it poured).
• 簡単だと思いきや、意外に手こずった (you'd think it was easy, but surprisingly it was a struggle).
• 怒られると思いきや、彼はにっこり笑った (you'd think I'd be scolded, but he smiled instead).

Feel: the front “A” is the speaker's original expectation, guess, and the back “B” is “the established, unexpected fact that turned out contrary to that expectation.” The core is “I thought it would be A, but unexpectedly (in fact) it was B,” with the vivid delight of surprise, reversal, the unforeseen. 「きや」 is literary (思ひきや), so it leans written, with a touch of the elegant or the witty, often for narrating surprising turns. In English: you'd think ～ but ～, expecting ～ but instead ～. (The near-synonym 〈かと思ったら〉 stresses “close timing”; 〈に反して〉 is a neutral “contrary to ～” — see below.)

Attachment & forms

Example sentences

• もう終わったと思いきや、まだ続きがあった。(You'd think it was over, but there was more to come.)
• 賛成してくれると思いきや、彼は強く反対した。(You'd think he'd agree, but he strongly objected.)
• 高そうだと思いきや、意外と手頃な値段だった。(You'd think it was pricey, but the price was surprisingly reasonable.)
• 負けると思いきや、逆転で勝利を収めた。(You'd think they'd lose, but they won in a comeback.)
• 静かな人だと思いきや、話し出すと止まらなかった。(You'd think a quiet person, but once talking they wouldn't stop.)

⚠️ Where learners slip up

① The back is an ‘established, unexpected fact' — not a guess, not a wish. The back of 「と思いきや」 must be a fact — “the result in fact (already established) turned out B” — with a sense of “ah, so it was, unexpectedly.” It can't take “a guess (it'll probably be B),” “a wish (I hope it's B),” or “will (I'll do B).” ✗「晴れると思いきや、雨が降るだろう (you'd think it'd clear, but it'll probably rain)」 — the back is a guess, not allowed; the back must be an established fact 「雨が降った (it rained).」 Test: the back is an established, unexpected fact “but it in fact turned out ～” → と思いきや works; the back is a guess, wish, or will → not allowed.

② It's the surprise of ‘expectation dashed,' not a mere time-turn. The core of 「と思いきや」 is “my original expectation was overturned by an unexpected fact” — the point is the “contrast, surprise between expectation vs. fact.” Don't confuse it with 「かと思ったら／かと思うと (just as ～, then ～; right after ～)」: the latter stresses “two events close in time, changing fast” (泣いていたかと思ったら、もう笑っている = crying one moment, laughing the next — close timing). Difference: と思いきや = the surprise of a dashed expectation (stresses reversal); かと思ったら = a fast turn close in time (stresses timing). Test: stressing “you'd think ～ but ～ (expectation overturned)” → と思いきや; stressing “just ～ and then (right away) ～ (fast change)” → かと思ったら.

③ Different from 「に反して」 — 「と思いきや」 carries a subjective ‘I thought,' 「に反して」 is neutral, objective. Both can be “contrary to expectation,” but the flavor differs. 「と思いきや」 carries a subjective ‘I originally thought,' the speaker's expectation dashed, with surprise, wit, story quality: 優勝すると思いきや、一回戦で敗れた (you'd think they'd win the title, but they lost in round one — with the surprise of “I thought”). 「に反して」 is a neutral, objective “contrary to ～,” more formal, without wit: 予想に反して、株価は下落した (contrary to forecast, the stock fell — an objective statement, see 〈に反して〉). Difference: と思いきや = the surprise with a subjective ‘I thought' (spoken narration, witty); に反して = a neutral, objective ‘contrary to ～' (formal, written). Test: to carry the surprise, story quality of “I thought ～ but unexpectedly” → と思いきや; to neutrally, objectively say “contrary to ～” → に反して.

④ 「きや」 is literary — don't misparse it as 「きゃ」 or take it as colloquial. The 「きや」 in 「と思いきや」 is literary (from 「思ひきや」), a fixed whole that can't be split or altered. It's not the colloquial 「きゃ (a contraction of ければ, as in 行かなきゃ)」 — the two are unrelated. 「と思いきや」 carries a literary, written, witty flavor, a fixed idiom to learn whole as “と思いきや = you'd think ～ but unexpectedly ～.” Test: on seeing 「と思いきや,」 read the whole as “you'd think ～ but ～,” don't dissect 「きや.」

🔄 Compare: と思いきや／かと思ったら／に反して／のに

💡 The key point in use

「〜と思いきや」 has a real “story” feel — it's made for that surprise moment of “huh? not what I expected!” 「簡単だと思いきや、大苦戦」「負けると思いきや、逆転勝ち」 carry reversal and drama in a single phrase. Its formula is “the (expected) A → the unexpected fact B.” Three points: ① the back must be ‘an established, unexpected fact' (not a guess or wish); ② the point is the reversal of ‘dashed expectation' (don't confuse with 「かと思ったら = close timing」); ③ it carries a subjective ‘I thought' (wittier, more story-like than the neutral 「に反して」). 「きや」 is literary — just learn it whole, don't dissect it.

❓ Questions you might have

Q: 「と思いきや」 and 「かと思ったら」 both feel like “you'd think” — how to tell them apart?

The difference is ‘reversal-surprise vs. close timing.' 「と思いきや」 = you'd think ～ but unexpectedly ～ (a dashed expectation): the point is “my original expectation was overturned by an unexpected fact,” stressing the contrast, surprise between expectation and fact: 勝つと思いきや、あっさり負けた (you'd think they'd win, but they lost easily — the point is the reversal of “thought win, but lost”). 「かと思ったら」 = just ～ and then (right away) ～ (close timing, fast turn): the point is “A just happened, and right after (quickly) B,” stressing that two events are close in time, changing fast: さっきまで泣いていたかと思ったら、もう笑っている (crying until moments ago, now already laughing — the point is how fast “cry → laugh” turned). Difference: 「と思いきや」 stresses ‘the reversal of dashed expectation' (I thought A but it's B); 「かと思ったら」 stresses ‘a fast turn close in time' (A just happened, then right away B). Test: stressing “you'd think ～ but ～ (expectation overturned)” → と思いきや; stressing “just ～ then right away ～ (fast change)” → かと思ったら. So “thought they'd win but lost” (reversal) uses と思いきや, “just cried, now laughing” (fast turn) uses かと思ったら.

Q: Is 「と思いきや」 formal? When is it used?

It's a pattern with a touch of the elegant, written, and also witty, usable in both formal and light narration, but less in blunt everyday conversation. 「きや」 is literary (from the archaic 「思ひきや」), so 「と思いきや」 itself carries a slightly written, elegant flavor; but because it often tells “an unforeseen reversal,” it also often carries wit, playfulness, making it well-suited to narration, reporting, blogs, storytelling — telling a surprising turn of “you'd think this, but it was that”: 優勝候補と思いきや、まさかの初戦敗退 (a title favorite, you'd think, but a shock first-round exit — witty, story-like). For the same meaning in everyday speech, it's more common to just say 「〜と思ったら（意外にも）〜」「〜と思ったのに、実は〜,」 more colloquial and blunt than 「と思いきや.」 Test: narration, reporting, storytelling, wanting a touch of elegant or witty surprise → と思いきや (written, story-like); blunt everyday conversation → 〜と思ったら／と思ったのに. So for essays and storytelling 「と思いきや」 is vivid, while pure chat often uses 「〜と思ったら.」

🖊️ Practice Questions (5)

Q1. 「空は晴れる___、急に大雨になった。」（thought it would clear up, but unexpectedly...）

(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) The original expectation vs. an unexpected fact

(B) Completely consistent

(C) Cause and effect

(D) Parallel

Q3. 「勝てると思いきや苦戦した」の意味は?

(A) Thought (I) could win, but unexpectedly had a tough fight

(B) Won easily

(C) Will surely lose

(D) There was no match

Q4. 「と思いきや」の語感は?

(A) Thought ~ but unexpectedly (a surprising contrast, with a touch of humor)

(B) An objective statement

(C) A command

(D) A pure condition

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 is required)。

Answer Explanations

1. (A) と思いきや ── Thought it would clear up, but unexpectedly heavy rain.

2. (A) ── The original expectation vs. an unexpected fact.

3. (A) ── Thought (I) could win, but unexpectedly a tough fight.

4. (A) ── Thought ~ but unexpectedly (a surprising contrast).

5. (A) ── 「楽勝だと思いきや、負けた」 is correct.