“ichigai ni 〜nai”: Cannot Generalize / Can't Say Across the Board [JLPT N1]
Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026
「高ければ良いとは一概に言えない」 — you can't paint everything with one brush.
「高ければ良いとは、一概には言えない」 — it's not that simple; you can't lump it all together
To cautiously say “you can't tar everything with one brush,” 「値段が高ければ良いとは、一概には言えない」 (you can't say across the board that expensive means good) — 「一概（いちがい）に〜ない」 = can't generalize, can't say sweepingly that all ～, used to negate an over-generalization, pointing out that there are exceptions, different cases. It's an expression of “caution, not being dogmatic” in commentary and argument. This guide covers attachment (must pair with a negative), the relation to 「必ずしも〜ない,」 and flags the Chinese 「一概」 false-friend trap.
Core: negate a sweeping, one-size-fits-all judgment
「一概（いちがい）に〜ない」 means “can't generalize, can't say sweepingly that all ～” — negating an over-generalization, a one-size-fits-all:
- 子供の成績が悪いのは親のせいだと、一概には言えない (you can't say across the board that poor grades are the parents' fault).
- 外国人だから日本語が下手だとは、一概には決めつけられない (you can't sweepingly assume foreigners are bad at Japanese).
- 若者はみな怠けているとは、一概には言えない (you can't say sweepingly that all young people are lazy).
Feel: the core is “negate a sweeping, one-size-fits-all judgment” — some claim (expensive = good, young = lazy) seems to hold, but actually there are exceptions, different cases, so “you can't judge that simply, that sweepingly.” It keeps judgment flexible, not dogmatic, often paired with 「一概には言えない・一概には決めつけられない.」 It corresponds to “can't generalize, can't say sweepingly that all ～, can't tar with one brush.”
How it attaches
| Form | Meaning | Example |
|---|---|---|
| 一概に（は）＋ 言えない | can't generalize | 一概には言えない （you can't generalize） |
| 一概に（は）＋ 決めつけられない | can't sweepingly assume | 一概には決めつけられない （you can't lump them all together） |
Example sentences
- 安いものが悪いとは、一概には言えない。(You can't say across the board that cheap things are bad.)
- 失敗が無駄だったとは、一概には言えない。(You can't say sweepingly that failure was a waste.)
- 都会の生活がいいとは、一概には言えないだろう。(You probably can't say across the board that city life is good.)
- 彼だけが悪いと、一概に責めることはできない。(You can't sweepingly blame only him.)
- 伝統は古いから捨てるべきだとは、一概には割り切れない。(You can't sweepingly conclude that tradition should be discarded just for being old.)
⚠️ Easy traps to avoid
① The Chinese 「一概」 and Japanese 「一概に〜ない」 are opposite in direction (the false-friend trap, most lethal). This is learners' most lethal misreading. Chinese 「一概」 = without exception, all (～): 「一概不見 (= see no one at all)」「一概拒絶 (= refuse everything)」 — Chinese 「一概」 means “all, without exception.” But Japanese 「一概に〜ない」 = can't generalize, not all ～ (there are exceptions): 一概には言えない (= can't say sweepingly that all ～, there are exceptions) — Japanese 「一概に〜ない」 means “can't lump it all together; there are exceptions.” The two are exactly opposite in direction! Chinese 「一概」 stresses “all, without exception,” while Japanese 「一概に〜ない」 stresses “can't lump it all together (there are exceptions).” So on seeing 「一概に,」 never reflexively apply the Chinese 「一概 (all)」 — it pairs with a negative and means “can't generalize.” Test: Japanese 「一概に〜ない」 = “can't tar with one brush, there are exceptions,” don't misread it as the Chinese “all, without exception.”
② 「一概に」 must pair with a negative. The core attachment limit. 「一概に」 almost only pairs with a negative (一概には言えない・決めつけられない・否定できない), not an affirmative: ✗ 一概に正しい (affirmative, doesn't hold) → ✓ 一概には言えない. Because its very meaning is “can't say sweepingly (one-size-fits-all) ～,” it necessarily carries a negative. Mnemonic: 一概には ＋ (言えない etc. negative) = can't generalize.
③ Near-synonym with 「必ずしも〜ない」; division of labor with the look-alike/sound-alike 「一向に／一斉に.」 「一概に〜ない」 vs 「必ずしも〜ない」 (near-synonyms): both express “not necessarily all ～, there are exceptions,” very close: 高ければ良いとは一概には言えない ≒ 高ければ必ずしも良いとは限らない (expensive isn't necessarily good) — both “negate the sweeping ‘all ～'” (see 〈かならずしも〉〈とは限らない〉). Subtle difference: 「一概に」 leans “can't lump it into a one-size-fits-all (judgment)” (stressing the crudeness of the judgment); 「必ずしも」 leans “not necessarily” (stressing it's not 100%). And separate two look-alike/sound-alike words (don't mix): 「一向に（いっこうに）〜ない」 = not at all ～, not in the slightest (stressing zero degree, e.g. 「一向に良くならない = doesn't improve at all」); 「一斉に（いっせいに）」 = all at once, simultaneously (everyone together at once, e.g. 「一斉に立ち上がる = stand up all at once」). These two look/sound like 「一概に」 but mean entirely different things — 一向に = not at all, 一斉に = all at once, don't mix. Test: “can't lump it together (there are exceptions)” → 一概に〜ない; “not necessarily” → 必ずしも〜ない; “not at all” → 一向に〜ない; “all at once” → 一斉に.
🔄 Compare: 一概に〜ない／必ずしも〜ない／一向に〜ない／一斉に
| Form | Meaning | Example |
|---|---|---|
| 一概に〜ない | can't generalize (negate a sweeping one-size-fits-all, exceptions) | 一概には言えない （you can't generalize） |
| 必ずしも〜ない | not necessarily (partial negation) | 必ずしもそうではない （that's not necessarily so） |
| 一向に〜ない | not at all ～, not in the slightest (degree) | 一向に良くならない （shows no improvement at all） |
| 一斉に | all at once, simultaneously (unrelated to 「一概」) | 一斉に立ち上がる （stand up all at once） |
💡 The key point in use
「一概に〜ない」 = can't generalize, can't lump it into a one-size-fits-all — three points: ①⭐the biggest trap: the Chinese 「一概 (all, without exception)」 and Japanese 「一概に〜ない (can't generalize, exceptions)」 are opposite in direction — don't apply the Chinese; ②「一概に」 must pair with a negative (一概には言えない, ✗一概に正しい); ③ near-synonym with 「必ずしも〜ない (not necessarily, ≒, see 〈かならずしも〉〈とは限らない〉),」 with a division of labor from the look-alike 「一向に (not at all)／一斉に (all at once).」 This pattern suits showing a “cautious, non-dogmatic” attitude in commentary, argument, meetings — not overstating, pointing out “there are exceptions, can't tar with one brush.” To objectively, measuredly say “can't generalize,” 「一概に〜ない」 is spot-on (remember it means the opposite of the Chinese 「一概」).
❓ Questions you might have
Q: Can the Chinese 「一概拒絶 (refuse everything)」 be said directly as Japanese 「一概に拒否する」?
No! This is exactly the classic false-friend trap — the Chinese 「一概」 and Japanese 「一概に」 are opposite in direction. Chinese 「一概」 = without exception, all (～): 「一概拒絶」 = “refuse everything (without exception),” 「一概不知」 = “know nothing at all” — the Chinese 「一概」 stresses “all, without a single exception.” But Japanese 「一概に」 = (can't) lump into a one-size-fits-all, and must pair with a negative: Japanese 「一概に〜ない」 = “can't generalize, not all ～ (there are exceptions),” the opposite meaning! So the Chinese 「一概拒絶 (refuse everything)」 cannot be directly translated as Japanese 「一概に拒否する」 — because Japanese 「一概に」 almost only pairs with a negative, and means “can't sweepingly ～,” so 「一概に拒否する (affirmative)」 doesn't hold and is wrong. The Japanese for the Chinese 「一概拒絶 (refuse all, without exception)」 should be 「すべて拒否する／一律に拒否する／例外なく拒否する」 (refuse all/uniformly/without exception). And Japanese 「一概に〜ない」 corresponds to the Chinese “can't generalize, can't tar with one brush”: 一概には言えない = can't generalize. Test: to express the Chinese 「一概 (all, without exception)」 → use Japanese 「すべて・一律に・例外なく」; to express the Japanese 「一概に〜ない (can't generalize)」 → it corresponds to the Chinese “can't generalize, there are exceptions.” Never equate the Chinese 「一概 (all)」 with the Japanese 「一概に〜ない (can't generalize)」 — they're opposite in direction, the most typical Chinese-Japanese false friend.
Q: Do 「一概には言えない」 and 「必ずしもそうとは限らない」 mean the same?
Very close (both “not necessarily all ～, there are exceptions”), mostly interchangeable, with a slight emphasis difference. Both negate the sweeping ‘all ～' and point out exceptions, near-synonyms for showing “caution, non-dogmatism” at N1. 「一概には言えない」 = can't generalize, can't lump into a one-size-fits-all: it leans “can't make such a sweeping, crude, one-size-fits-all judgment,” stressing “it's not that simple, cases differ”: 若者はみんな怠けているとは、一概には言えない (can't say sweepingly that all young people are lazy — cases differ, there are exceptions). Its focus is “negating the ‘one-size-fits-all, sweeping' way of judging.” 「必ずしも〜とは限らない／必ずしもそうではない」 = not necessarily (all so): it leans “not necessarily, not 100%,” stressing “not absolute, not all ～”: 高いものが必ずしも良いとは限らない (expensive things aren't necessarily good — not absolute, there are exceptions) (see 〈かならずしも〉〈とは限らない〉). Its focus is “negating the ‘absolute, inevitable' (100%).” The difference is subtle: 「一概には言えない」 leans “can't lump into a one-size-fits-all (the judgment method is too crude)”; 「必ずしも〜ない」 leans “not necessarily (not 100%).” In practice the two are often interchangeable (一概には言えない ≒ 必ずしもそうとは限らない), both “there are exceptions, can't say all ～.” Test: to stress “can't judge that sweepingly, crudely” → 一概には言えない; to stress “not necessarily (not absolute)” → 必ずしも〜ない／とは限らない. The two are partner near-synonyms in the “not-necessarily／exceptions” family, with a slight emphasis difference but often interchangeable.
🖊️ Practice Questions (5)
Q1. 「高ければ良いとは、___言えない。」(Can't generalize)
(A) 一概に (B) 一向に (C) 一斉に (D) 一気に
Q2. 「一概に」とよく呼応するのは?
(A) 〜ない（negation） (B) 〜たい (C) 〜よう (D) 〜ろ
Q3. 「一概に悪いとは言えない」の意味は?
(A) Can't categorically call it bad (there are exceptions)
(B) It's definitely bad
(C) It's absolutely good
(D) Don't care whether good or bad
Q4. 「一概に〜ない」の意味は?
(A) Can't lump it all together (generalize)
(B) Complete denial
(C) Strong affirmation
(D) Command
Q5. 用法が正しいのは?
(A) 一概には判断できない。 (B) 一概に正しい(affirmative)。
(C) 一概に行く。 (D) 一概にだ高い。
Answer Explanations
1. (A) 一概に ── Can't generalize.
2. (A) 〜ない ── Must correspond with a negative.
3. (A) ── Can't categorically call it bad.
4. (A) ── Can't generalize.
5. (A) ── 「一概には判断できない」 is correct.