connective N1 uncommon writtenliterary
〜いかんで（は） — depending on ~
〜いかんで（は） ・ いかんで
Builds on 〜如何（だ）
Meaning
- depending on ~ / according to how ~ is — the formal connective form of 如何, with the outcome hinging on the named factor
如何 + で turns 'the state of X' into 'depending on the state of X, the result varies'. 検査の結果いかんで、治療方針が決まる ('depending on the test results, the course of treatment will be decided'). It's the stiff, written equivalent of 次第で. The variants 如何によって(は) mean the same; 如何によらず / 如何にかかわらず flip it to 'regardless of ~'.
Key sentence
今後の対応いかんで、会社の信用が左右される。
Depending on how it is handled from here, the company's credibility will be made or broken.
Formation
| Attaches to | Form | Example |
|---|---|---|
| Noun (often + の) + いかんで（は）/ いかんによって（は） | N（の）+ いかんで | 出来いかんで / 天候のいかんによって |
When: Formal/written; the following clause states a result that swings with the named factor. いかんでは singles out one possible branch ('depending on the case, it might even ~').
Examples
成績いかんでは、奨学金が打ち切られることもある。
Depending on the grades, the scholarship may even be discontinued.
交渉の進み方いかんによって、契約内容が変わる。
Depending on how the negotiations progress, the terms of the contract will change.
Easily confused with
〜次第で Same meaning, different register: 次第で is the standard formal 'depending on'; いかんで is stiffer and more bureaucratic/literary, common in official and written contexts. によって によって in its 'varies-by' sense is the neutral everyday 'differs depending on'; いかんで stresses that the *outcome hinges on the nature of* the factor, in formal writing. にかかわらず Opposite logic: いかんで means the result *depends on* the factor; いかんにかかわらず / にかかわらず means the result holds *regardless of* it.
Notes
- All built on 如何 ('the state of ~'). Watch the polarity: 〜いかんで = depends on; 〜いかんによらず／にかかわらず = regardless of.
See 〜いかんで（は） in real sentences
Jengo shows 〜いかんで（は） the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled with reference to A Dictionary of Advanced Japanese Grammar.