“oyoso / daitai / zatto” — Roughly / Approximately [JLPT N1]
Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026
Adverbs for rough estimates — “about two hours,” “more or less” — plus およそ…nai (“not at all”), with examples. (JLPT N1)
「およそ2時間」「大体わかった」 — about, roughly, at a glance
For estimating quantity and degree, Japanese has a set of imprecise adverbs — 「駅まではおよそ2時間かかる (it takes about 2 hours to the station)」「説明を聞いて、大体わかった (hearing the explanation, I roughly understood).」 「およそ／大体／ざっと」 = about, roughly, at a glance. This guide clarifies the three's split, and specially notes that 「およそ」 has a special use: 「およそ〜ない = not at all, utterly not,” finally separating it from the pre-number 「約.」
Core: estimating about, roughly, at a glance
All three express an imprecise estimate, but differ in emphasis:
①「およそ」 = about, approximately (estimating quantity, more written):
- 会場にはおよそ千人が集まった (about a thousand people gathered at the venue).
②「大体（だいたい）」 = roughly, more or less (an approximation of degree, colloquial and general):
③「ざっと」 = roughly, at a glance (doing something quickly, imprecisely):
- 資料にざっと目を通す (skim through the materials at a glance).
- 費用はざっと見積もっても百万円だ (even a rough estimate puts the cost at a million yen).
⚠️Plus a special use: 「およそ〜ない」 = not at all, utterly not:
- そんな話は、およそ現実的でない (such a story is not at all realistic).
Feel: およそ = about (estimating numbers, written); 大体 = roughly (degree, colloquial); ざっと = roughly, quickly (doing something). In English: about, roughly, at a glance, approximately.
Attachment rules
| Adverb | Meaning | Emphasis | Example |
|---|---|---|---|
| およそ | about／(〜ない) not at all | estimating numbers (written)／utter negation | およそ千人 |
| 大体 | roughly, more or less | an approximation of degree (colloquial) | 大体わかった （got the gist of it） |
| ざっと | roughly, at a glance | doing quickly, imprecisely | ざっと目を通す |
| およそ〜ない | not at all, utterly not | stressing total negation | およそ意味がない （has no meaning whatsoever） |
Examples in context
- この工事には、およそ三年かかる見込みだ。(This construction is expected to take about three years.)
- 彼の言いたいことは、大体わかる。(I roughly get what he wants to say.)
- 時間がないので、ざっと説明します。(As there's no time, I'll explain roughly.)
- ざっと見ただけでも、百点はある。(Even at a glance, there are a hundred items.)
- そんな夢物語は、およそ実現性がない。(Such a pipe dream has no chance of realization at all.) — およそ〜ない
⚠️ Common mistakes to avoid
① ⭐「およそ」 has two meanings: ① about (estimating) ② (およそ〜ない) not at all, utterly. This is the most easily missed point. Besides “about,” 「およそ」 before a negative also means “utterly, at all.” ①「およそ」 = about, approximately (estimating quantity): およそ2時間 (about 2 hours), およそ千人 (about a thousand). ②「およそ〜ない」 = not at all, utterly not (stressing total negation): この計画はおよそ現実的でない (this plan is not at all realistic), 彼の態度はおよそ社会人らしくない (his attitude is nothing like a working adult's at all), およそ意味がない (utterly meaningless). This use ② 「およそ」 = 「まったく、到底」 (utterly, at all), before a negative, stressing “not at all, no ～ whatsoever.” Test: 「およそ ＋ quantity」 → ① about (およそ2時間); 「およそ ＋ negative」 → ② not at all, utterly (およそ意味がない). On seeing 「およそ〜ない,」 don't read it as “about not,” it's “not at all.”
② およそ (estimating numbers, written)／大体 (degree, colloquial)／ざっと (rough action) — the split. All three are “imprecise,” but differ in emphasis, register. 「およそ」 = about (estimating quantity, more written, formal): およそ千人 (about a thousand — estimating a number, written). 「大体」 = roughly (an approximation of degree, colloquial and general): 大体わかった (roughly understood — an approximation of degree, colloquial), 大体終わった (roughly finished). It mostly expresses “an approximation of degree,” common in speech. 「ざっと」 = roughly, at a glance (doing some action quickly, imprecisely): ざっと目を通す (skim), ざっと計算する (calculate roughly) — “doing some action quickly, roughly,” mostly with a verb. Difference: 「およそ」 leans estimating quantity (written); 「大体」 leans an approximation of degree (colloquial); 「ざっと」 leans doing some action roughly, quickly. Test: estimating a quantity (written) → およそ; an approximation of degree (colloquial) → 大体; doing (skimming／calculating) roughly, quickly → ざっと.
③ Separate it from the pre-number 「約」 — 約 = approximately (before a number only, most formal). Here's a common addition. 「約（やく）」 = approximately ～ (placed before a number, most formal, written): 約2時間 (approx. 2 hours), 約千人 (approx. a thousand), 約3割 (approx. 30%). It's a formal estimating word placed before a number, common in notices, reports. 「およそ」 and 「約」 are close (both “about”), but 「約」 goes only before a number, is more concise and formal, while 「およそ」 is a bit more colloquial and can also do 「およそ〜ない (not at all).」 Test: a formal estimate before a number → 約 (約2時間); a general estimate or “not at all” → およそ. The three to remember: 約 = before a number (most formal), およそ = about (written, ＋ not-at-all), 大体 = roughly (colloquial), ざっと = a rough action.
🔄 Compare: およそ／大体／ざっと／約
| Adverb | Meaning | Emphasis | Example |
|---|---|---|---|
| およそ | about／(〜ない) not at all | estimating quantity (written)／total negation | およそ千人 |
| 大体 | roughly, more or less | an approximation of degree (colloquial) | 大体わかった （got the gist of it） |
| ざっと | roughly, at a glance | doing quickly, imprecisely | ざっと目を通す |
| 約 | approximately ～ | before a number (most formal) | 約2時間 |
💡 Quick takeaway
「およそ／大体／ざっと」 = about, roughly, at a glance — three points: ①⭐「およそ」 has two meanings — ① about (およそ2時間), ② (およそ〜ない) not at all, utterly (およそ意味がない); ② the three's split — およそ = estimating numbers (written), 大体 = an approximation of degree (colloquial), ざっと = doing some action roughly, quickly (skimming／calculating); ③ separate it from the pre-number 「約」 — 約 is most formal, before a number only. This set of estimating adverbs is super handy — for “about how much” use 「およそ／約,」 for “roughly understood” use 「大体,」 for “take a quick look” use 「ざっと.」 Most tested is 「およそ」's hidden use: on seeing 「およそ〜ない,」 don't think “about not” — it's “not at all, utterly not” (およそ考えられない = utterly unthinkable).
❓ Questions you might have
Q: Does 「およそ意味がない」 mean ‘about meaningless'?
No — it means ‘utterly meaningless, not meaningful at all.' This is 「およそ」's most easily misread hidden use. Besides “about” (estimating), before a negative 「およそ」 means “utterly, at all, in the least,” stressing total negation: 「およそ意味がない」 = “utterly meaningless” (not “about meaningless”), 「およそ現実的でない」 = “not at all realistic,” 「およそ考えられない」 = “utterly unthinkable,” 「彼の行動はおよそ理解できない」 = “his behavior is completely incomprehensible.” This use's 「およそ」 = 「まったく (utterly), 到底 (at all),” entirely different from the estimating “about.” Its logic: 「およそ」 originally means “in general, on the whole,” extended into a negative sentence to become “on the whole (utterly) not ～ = not at all.” Test: 「およそ ＋ quantity」 = about (およそ2時間 = about 2 hours); 「およそ ＋ negative (〜ない)」 = not at all, utterly (およそ意味がない = utterly meaningless). On seeing 「およそ〜ない,」 always read it as “not at all, utterly not,” not “about not.”
Q: What's the difference between 「大体」 and 「ざっと」? Both ‘roughly'?
The difference is ‘an approximation of degree' vs ‘doing some action roughly, quickly.' 「大体（だいたい）」 = roughly, more or less (an approximation of degree, colloquial and general): it means “an approximation of degree, general direction,” stressing “roughly, pretty much,” mostly for understanding, completion, state: 話は大体わかった (roughly understood the talk — an approximation of understanding degree), 準備は大体終わった (preparations are roughly done — degree of completion), 大体そんなところだ (roughly that's it). It's “roughly” of degree, state, very common in speech. 「ざっと」 = roughly, at a glance (doing some action quickly, imprecisely): it means “doing some action quickly, roughly,” stressing “not carefully, quickly skimming,” mostly with a verb (look, calculate, explain): 資料にざっと目を通す (skim through the materials — looking quickly, roughly), ざっと計算する (calculate roughly), ざっと説明する (explain roughly). It's “rough, quick” of an action. Difference: 「大体」 = an approximation of degree, state (roughly understood／done, colloquial); 「ざっと」 = doing some action roughly, quickly (skim／calculate, mostly with a verb). Test: to say “(degree of understanding, completion) roughly ～” → 大体 (大体わかった); to say “(quickly, roughly) do some action” → ざっと (ざっと目を通す). So “roughly understand” uses 「大体わかった,」 “skim through” uses 「ざっと目を通す.」
🖊️ Practice Questions (5)
Q1. 「式典には___300名が出席した。」(About 300 people attended the ceremony) 書面的な言い方は？
(A) およそ (B) ぴったり (C) たった (D) せいぜい
Q2. 「そんな計画は___考えられない。」(That kind of plan is utterly inconceivable)
(A) およそ (B) およぼし (C) およびに (D) およそで
Q3. 「ざっと計算して、3万円はかかる。」What does this sentence mean?
(A) A rough estimate: it will cost about 30,000 yen
(B) After precise calculation, exactly 30,000 yen
(C) Definitely under 30,000 yen
(D) No money is needed at all
Q4. 「およそ」「大体」「ざっと」の説明として正しいものは？
(A) およそ＝formal written estimate; 大体＝common in both speech and writing; ざっと＝quick and rough
(B) All three are exactly the same
(C) ざっと is the most formal
(D) 大体 can only be used in writing
Q5. 「およそ」が「完全に〜ない(utterly not)」の意味で使われている文はどれか？
(A) およそ意味のない議論だ。 (B) およそ100人が来た。
(C) 費用はおよそ1万円だ。 (D) 作業はおよそ3時間かかる。
Answer Explanations
1. (A) およそ ── 「およそ300名」 = about 300 people (written, formal estimation).
2. (A) およそ ── 「およそ〜ない」 = "utterly not" (the other N1 sense of およそ).
3. (A) A rough estimate: it will cost about 30,000 yen ── ざっと = quickly and roughly.
4. (A) ── およそ is written/formal, 大体 works in both speech and writing, ざっと is quick and rough.
5. (A) ── (A) 「およそ意味のない」 = utterly meaningless; the rest mean 'about.'