いかに

Japanese Grammar Advanced Japanese ★★★ 3/5 formal いかにikani
読み いかに
ローマ字 ikani
形 いかに + Adjective/Verb + か / いかに + Verb-ても

意味

An adverb meaning 'how' or 'how much,' used to emphasise the degree or manner of something. It is more formal and literary than どんなに or どれほど and frequently appears in written Japanese and speeches.

いかに functions in two main ways. First, as an exclamatory or rhetorical intensifier meaning 'how very' — いかに困難であるか (how difficult it is). Second, as a conditional concession meaning 'no matter how' when paired with ～ても or ～とも — いかに努力しても (no matter how hard one tries). It is considerably more formal than どんなに and carries a weight suited to essays, editorials, and public addresses. The combination いかにも means 'indeed' or 'truly' and is a separate fixed expression. いかに often co-occurs with か to form indirect questions: いかに重要であるかを理解する.

例文

  1. 今回の事故は、安全管理がいかに重要であるかを浮き彫りにした。
  2. いかに優秀な技術者であっても、一人では限界がある。
  3. 彼の演説は、聴衆にいかに深い感銘を与えたことか。

使い方ガイド

場面: written, formal, academic

トーン: emphatic

正しい言い方

  • この研究は、環境問題がいかに深刻であるかを示している。
  • いかに技術が進歩しても、人間の判断力は不可欠だ。
  • 留学を通じて、異文化理解がいかに大切かを実感した。

避ける言い方

  • いかにおいしいラーメンだった。(Using いかに in casual conversation where どんなに or すごく would be natural) → どんなにおいしいラーメンだったことか。
  • いかに走っても電車に間に合った。(Using いかに～ても in a sentence where the expected negative outcome does not follow) → いかに走っても電車には間に合わなかった。

起源と歴史

いかに is a classical Japanese adverb composed of いか (how, what manner) and the particle に. It has been used since the Nara period in both prose and poetry, maintaining its formal register throughout Japanese literary history.

文化的背景

世代: All ages

社会的背景: Universal

関連フレーズ

つい An adverb meaning 'unintentionally' or 'inadvertently,' used when someone does something without meaning to or without being able to control the impulse. It conveys that the action happened against the speaker's better judgement or awareness. なお An adverb with two primary functions: indicating that a state or action is still continuing ('still'), and serving as a conjunctive adverb to add supplementary information ('furthermore' or 'additionally'). Both uses are common in formal writing. なるほど An adverb meaning 'indeed,' 'I see,' or 'that makes sense,' used when the speaker acknowledges and affirms the correctness or reasonableness of something they have just heard or realised. It signals understanding and agreement. あえて An adverb meaning 'dare to' or 'deliberately,' used when the speaker chooses to do something despite knowing it may be difficult, risky, or contrary to expectations. It conveys a sense of resolve or intentional defiance of the easier or more conventional path. あくまでも An adverb meaning 'to the very end,' 'strictly,' or 'nothing more than,' used to express unwavering persistence in an attitude or to limit the scope of a statement. It conveys the speaker's firm stance that something will not change regardless of circumstances. およそ An adverb with two main uses: as an approximation marker meaning 'approximately' or 'roughly,' and as a totality marker meaning 'at all' or 'utterly' when used with negatives. It adds a formal, measured tone to statements. さぞ（かし） An adverb meaning 'surely,' 'no doubt,' or 'I can only imagine,' used when the speaker empathetically infers that someone must be experiencing a strong emotion or condition. It expresses sympathetic conjecture about another's feelings. なおさら An adverb meaning 'all the more' or 'even more so,' indicating that the degree of something increases due to an additional factor or condition. It expresses that a situation that was already notable becomes even more pronounced.
WordLociで練習する

フラッシュカード、クイズ、音声発音、間隔反復