Japanese Dependency: Depending on... (いかん)
いかん for formal dependencies where the outcome hinges seriously on the state of a specific condition.
Grammar Rule in 30 Seconds
Use {いかん|いかん} to express that an outcome depends entirely on a specific condition or factor.
- Attach to a noun directly: {結果|けっか}いかん
- Often followed by {によって|によって} or {を問わず|をとわず}
- Used primarily in formal, written, or business contexts
Overview
The grammatical structure いかん ({如何}) is a formal noun used in advanced Japanese to express a strong, critical dependency. Its core meaning translates to "depending on the state/circumstances of..." or "contingent upon...". Unlike more common expressions of dependency like によって or 次第, いかん belongs to a much higher register of formality.
You'll primarily encounter it in written Japanese: legal documents, official announcements, academic papers, and serious business communication.
Using いかん signals that the outcome of a situation is not just influenced by a condition, but is critically determined by the specific nature, quality, or state of that condition. It elevates the tone, indicating that the matter is of significant weight and the conditions are being considered with precision. Its presence implies high stakes.
For example, 検査結果いかんでは、緊急手術が必要になる。 (Depending on the results of the examination, emergency surgery may become necessary.) Here, いかん stresses that the specifics of the results—not just their existence—are the sole factor determining the drastic next step. It frames the situation as a critical juncture.
How This Grammar Works
いかん is a noun derived from classical Japanese. It originates from the kanji 如何 (how; in what way) combined with the nominalizing suffix ん. This gives it the literal meaning of "the state of how things are" or "the circumstances." Understanding いかん as a formal noun for "circumstances" is the key to using it correctly.いかん to another noun, as in Noun + いかん, you are creating a compound noun phrase that means "the circumstances of the Noun." This phrase then becomes the subject or topic that the rest of the sentence elaborates on. The grammar works by focusing on the quality or content of the noun, not just its presence. It forces the listener to consider a spectrum of possibilities for that noun and how each possibility leads to a different outcome.対応いかんでは、顧客の信頼を失いかねません。 (Depending on our response, we could lose customer trust.) This isn't a simple if-then statement. It implies that the nature of the 対応 (response)—whether it is swift, slow, apologetic, or defensive—is the critical variable. The structure いかんでは sets up a conditional framework where the specific character of the noun directly dictates the consequence.Word Order Rules
いかん follows a strict and predictable word order, always attaching to a noun or a nominalized phrase. The subsequent particle then determines the logical relationship with the main clause.Noun + いかん. In older or more literary texts, you may see Noun + の + いかん, which makes the possessive relationship explicit ("the circumstances of the Noun"). However, in modern business and official writing, the の is almost always omitted for conciseness.- Modern/Standard:
成績いかん(the state of the grades) - Classical/Literary:
成績のいかん(the state of the grades)
いかん is attached, a particle defines its role in the sentence. The most common patterns are:...いかんだ / ...いかんによる | Declarative | "It depends on..." / "It is determined by..." |...いかんでは / ...いかんによっては | Conditional | "Depending on..., (something might happen)" |...いかんによらず / ...いかんを問わず | Concessive | "Regardless of..." / "Without concern for..." |- Declarative:
今後の処遇は君の成果いかんだ。(Your future treatment depends on your results.) This makes a definitive statement. - Conditional:
天候いかんによっては、イベントは中止となります。(Depending on the weather conditions, the event will be cancelled.)によってはsubtly emphasizes that cancellation is one of several possibilities based on the weather. - Concessive:
理由のいかんを問わず、遅延は認められない。(Regardless of the reason, delays will not be accepted.)を問わずis particularly strong, implying a strict, non-negotiable rule.
Formation Pattern
いかん, you first identify the determining condition (as a noun) and then select the appropriate particle to express either dependency or non-dependency.
[Noun / Nominalized Phrase] + (の) + いかん + [Particle]
いかん Form | Meaning |
結果) | いかんでは / いかんによっては | "Depending on the result..." |
努力) | いかんだ | "It depends on your effort." |
国籍) | いかんによらず / いかんを問わず | "Regardless of nationality..." |
いかん cannot attach directly to verbs or adjectives. You must first transform the clause into a noun phrase, typically using {か{どうか}|かどうか}.
Verb (plain form) + かどうか + の + いかん
参加するいかんでは...
参加するかどうかのいかんでは、計画が変わります。 (Depending on whether or not they participate, the plan will change.)
Adjective (plain form) + かどうか + の + いかん
安全いかんでは...
安全かどうかのいかんでは、実行を見送るべきです。 (Depending on whether or not it is safe, we should postpone implementation.)
いかん requires.
When To Use It
いかん when you need to convey seriousness, authority, and precision in formal contexts. Its use is a stylistic choice that signals your command of advanced, official Japanese.- Legal and Official Documents: Use it to state conditions, terms, and consequences with absolute clarity. Contracts, laws, and regulations rely on this level of precision.
違反の内容いかんによっては、契約を即時解除することがあります。(Depending on the nature of the violation, the contract may be terminated immediately.)
- Formal Business Communication: In reports, presentations, or high-level emails,
いかんunderscores the gravity of business decisions and their dependencies. 来期の予算は、今年度の業績いかんで大きく変動します。(Next term's budget will fluctuate greatly depending on this fiscal year's performance.)
- News Reporting and Public Announcements: Journalists and officials use
いかんto report on developing situations where outcomes are contingent on specific factors, maintaining a tone of objectivity and gravity. 政府の対応いかんでは、市場に混乱が生じる恐れがあります。(Depending on the government's response, there is a risk of turmoil in the market.)
- Stating Inflexible Rules (
いかんを問わず): Use this form to establish universal policies where no exceptions will be made. It communicates strictness and impartiality. 年齢や性別のいかんを問わず、どなたでもご応募いただけます。(Regardless of age or gender, anyone may apply.)
Common Mistakes
いかん involves avoiding several common traps related to its formality and grammatical function.- Using It in Casual Conversation: This is the most frequent error. Using
いかんfor everyday topics sounds incredibly stiff and out of place. Reserve it for formal contexts. - Incorrect:
「今夜の夕食、冷蔵庫の中身いかんで決めよう。」 - Correct (Casual):
「今夜の夕食、冷蔵庫の中身によって/次第で決めよう。」(Let's decide tonight's dinner depending on what's in the fridge.)
- Confusing
いかんではandいかんによらず: These have opposite meanings. Using the wrong one can make your sentence nonsensical. - Incorrect:
経験のいかんによらず、給与が変わります。(Regardless of experience, the salary changes.) This is a logical contradiction. - Correct:
経験のいかんでは、給与が変わります。(Depending on experience, the salary changes.)
- Forgetting to Nominalize Verbs/Adjectives: You cannot attach
いかんdirectly to a verb or adjective. This is a fundamental grammatical error. - Incorrect:
成功するいかんでは... - Correct:
成功するかどうかのいかんでは...(Depending on whether it succeeds...)
- Confusing
いかんwithいかんせん: These are completely unrelated words.いかんせん({如何せん}) is an adverb meaning "unfortunately," "regrettably," or "try as one might." It expresses frustration or regret about an unchangeable situation. いかんせんExample:いかんせん、時間が足りなかった。(Unfortunately, there just wasn't enough time.) It has no conditional meaning.
Contrast With Similar Patterns
いかん, 次第, and によって is a matter of understanding formality and nuance. They are not freely interchangeable.いかん ({如何}) | 次第 ({次第}) | によって ({によって}) |...かどうか). | Noun or Verb Stem (V-ます stem). | Noun. |手術の成否いかんが命を左右する。 (The success/failure of the surgery will determine life or death.) | 詳細が決まり次第、ご連絡します。 (As soon as the details are decided, I will contact you.) | 人によって意見が違う。 (Opinions differ depending on the person.) |によって for general variations, 次第 for procedural steps in business, and いかん for critical, high-stakes junctures where the very nature of a condition will decide the future course of events.Real Conversations
While not used in casual chat, いかん appears regularly in its proper formal contexts. Here’s how you would see it in modern, real-world situations.
1. In a Formal Business Email:
An excerpt from a project update to senior management.
- 「進捗状況いかんでは、納期の再調整も視野に入れざるを得ません。」
- (Depending on the state of progress, we cannot help but consider rescheduling the delivery date.)
2. In University Regulations:
A clause from an academic code of conduct.
- 「理由のいかんを問わず、試験における不正行為は、最も厳しい処分の対象となります。」
- (Regardless of the reason, any act of cheating on an examination will be subject to the most severe disciplinary action.)
3. During a Press Conference:
A government official addressing a crisis.
- 「専門家チームの調査結果いかんによっては、現行の規制を強化する可能性がございます。」
- (Depending on the findings of the expert team's investigation, there is a possibility that current regulations will be strengthened.)
4. In a Legal Contract:
A termination clause in a service agreement.
- 「本契約は、相手方の重大な規約違反いかんにより、通知をもって解除できるものとする。」
- (This contract may be terminated upon notification, contingent upon a major breach of terms by the other party.)
Quick FAQ
- Q: Can I ever use
いかんwhen speaking? - A: Only in extremely formal situations, like a high-stakes business presentation, a formal speech, or a press conference. For 99% of spoken interactions, even in business,
によってor次第is more natural.
- Q: Is
Noun + の + いかんwrong? - A: Not wrong, but it can sound a bit dated or overly literary in modern business contexts. Omitting
のis the current standard for clear, concise formal writing.
- Q: What's the quickest way to remember
いかんvs.次第? - A:
次第is often for process ("as soon as X is done, Y happens").いかんis for a critical state ("the quality of X determines Y").
- Q: Why must I use
かどうかwith verbs? - A: Because
いかんneeds a noun representing a "state of affairs." A verb like行く(to go) is an action.行くかどうか(whether to go or not) is a noun phrase representing the uncertain circumstance, which is whatいかんattaches to.
- Q:
いかんによらずvs.いかんを問わず: any real difference? - A: They are very similar, but
を問わず("without questioning") feels slightly more absolute and dogmatic. It's perfect for laying down a non-negotiable rule where the condition is declared completely irrelevant.
- Q: Is
いかんa common JLPT N1 grammar point? - A: Yes, absolutely. Its formality, specific nuance, and contrast with similar patterns make it a classic item for testing advanced grammatical precision in the reading and grammar sections of the JLPT N1.
Formation Table
| Noun | Grammar | Resulting Phrase |
|---|---|---|
|
理由
|
いかんを問わず
|
理由いかんを問わず
|
|
結果
|
いかんで
|
結果いかんで
|
|
交渉
|
いかんによっては
|
交渉のいかんによっては
|
|
努力
|
いかんだ
|
努力いかんだ
|
|
天候
|
いかんにかかわらず
|
天候のいかんにかかわらず
|
|
判断
|
いかんによる
|
判断いかんによる
|
Meanings
Indicates that the outcome of a situation is contingent upon a specific factor or condition.
Contingency
The result is decided by the state of the preceding noun.
“{交渉|こうしょう}のいかんで、{契約|けいやく}が{決|き}まる。”
“{成功|せいこう}するかは、{努力|どりょく}いかんだ。”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Noun + いかん + だ
|
成功は努力いかんだ。
|
|
Negative
|
Noun + いかんを問わず
|
理由いかんを問わず禁止。
|
|
Conditional
|
Noun + いかんで
|
結果いかんで決まる。
|
|
Regardless
|
Noun + いかんにかかわらず
|
天候いかんにかかわらず。
|
|
Dependency
|
Noun + いかんによる
|
判断いかんによる。
|
|
Possibility
|
Noun + いかんによっては
|
交渉のいかんによっては。
|
Formality Spectrum
結果は努力いかんにかかっている。 (Business/Formal)
結果は努力次第だ。 (Business/Formal)
頑張り次第だよ。 (Business/Formal)
やる気次第。 (Business/Formal)
Dependency Flow
Outcomes
- 決まる Decided
- 変わる Changes
Examples by Level
これは難しいです。
This is difficult.
結果によります。
It depends on the result.
理由は何ですか。
What is the reason?
頑張ります。
I will do my best.
結果いかんで決まる。
It is decided by the result.
理由いかんにかかわらず。
Regardless of the reason.
状況いかんによる。
It depends on the situation.
判断いかんだ。
It depends on the judgment.
交渉のいかんで契約が変わる。
The contract changes depending on the negotiation.
天候のいかんにかかわらず実施する。
We will hold it regardless of the weather.
努力のいかんで結果は変わる。
The result changes depending on the effort.
理由のいかんを問わず禁止です。
It is prohibited regardless of the reason.
本件のいかんについては、後日報告する。
Regarding the state of this matter, I will report later.
成績のいかんにかかわらず、全員が参加できる。
Regardless of grades, everyone can participate.
今後の対応いかんで、方針を見直す。
We will review the policy depending on future responses.
会議のいかんで、スケジュールを調整する。
We will adjust the schedule depending on the meeting.
理由のいかんを問わず、本規定は厳守されるべきである。
Regardless of the reason, these regulations must be strictly followed.
交渉のいかんによっては、撤退も視野に入れる。
Depending on the negotiation, we will consider withdrawal.
成功のいかんは、君の準備にかかっている。
The success depends on your preparation.
事態のいかんにかかわらず、冷静さを保つこと。
Regardless of the situation, stay calm.
その是非のいかんは、歴史が判断するであろう。
History will judge the right or wrong of it.
いかなる理由のいかんを問わず、許可は下りない。
Regardless of any reason, permission will not be granted.
事のいかんを精査した上で、回答する。
I will respond after scrutinizing the state of affairs.
結果のいかんを問わず、最善を尽くした。
Regardless of the result, I did my best.
Easily Confused
Both mean 'depending on'.
Common Mistakes
食べるいかん
結果いかん
友達と話すいかん
状況のいかん
いかんによって
結果のいかんによって
いかんを問わず
理由のいかんを問わず
Sentence Patterns
___のいかんを問わず、実行する。
Real World Usage
交渉のいかんによって、決定します。
理由のいかんを問わず、返金不可。
天候のいかんにかかわらず開催。
成功のいかんは、データに依存する。
状況のいかんで変更あり。
努力のいかんを問わず、感謝します。
Noun Check
Avoid Casual
Pairing
Professionalism
Smart Tips
Use いかん to sound professional.
Use いかんを問わず for clarity.
Use noun + いかん.
Use いかんだ。
Pronunciation
Pitch accent
いかん is usually flat or high-low.
Formal statement
Noun + いかん + だ ↓
Assertive and professional.
Memorize It
Mnemonic
I-can (いかん) do it, depending on my effort!
Visual Association
Imagine a scale. On one side is a Noun (like 'Effort'), and on the other is the 'Outcome'. The word 'いかん' is the pivot point of the scale.
Rhyme
I-kan, I-kan, depending on the plan.
Story
The CEO stood up. He said, 'The project's fate rests on the negotiation.' He used the word 'いかん' to sound very serious. Everyone in the room nodded, knowing the stakes were high.
Word Web
Challenge
Write three sentences using 'いかん' regarding a fake business project.
Cultural Notes
Used to show respect and distance.
Used in contracts to define conditions.
Used in papers to discuss variables.
Derived from classical Japanese 'いか（如何）' meaning 'how'.
Conversation Starters
プロジェクトの成功は、何いかんだと思いますか？
Journal Prompts
Common Mistakes
Test Yourself
理由の___を問わず、禁止です。
Which is formal?
Find and fix the mistake:
食べるいかんで決まる。
いかん / 理由 / を問わず / の
Regardless of the result.
Answer starts with: 結果い...
Match each item on the left with its pair on the right:
___いかんで、方針が変わる。
天候の___にかかわらず。
Score: /8
Practice Exercises
8 exercises理由の___を問わず、禁止です。
Which is formal?
Find and fix the mistake:
食べるいかんで決まる。
いかん / 理由 / を問わず / の
Regardless of the result.
いかん = ?
___いかんで、方針が変わる。
天候の___にかかわらず。
Score: /8
Practice Bank
10 exercises{成否|せいひ}の___、{全力を尽くす|ぜんりょくをつくす}ことが{大切|たいせつ}だ。
Depending on the content, the price may change.
Select the formal way to say 'Depending on the reason...'
Match the following:
Arrange these words:
おいしいいかんでは、また買いに来ます。
{交渉|こうしょう}の___によっては、{契約|けいやく}を{打ち切る|うちきる}。
It depends on the company's decision.
The government's response [depends on] the situation.
Match context with grammar:
Score: /10
FAQ (8)
No, it must follow a noun.
Yes, very formal.
いかん is more formal.
Only if it's a formal business text.
It means 'depending on'.
In formal writing, yes.
Yes, '天候のいかんにかかわらず'.
Yes, frequently.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
dependiendo de
Register.
en fonction de
Noun vs phrase.
abhängig von
Structure.
次第
Formality.
يعتمد على
Part of speech.
取决于
Verb vs Noun.
Learning Path
Prerequisites
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