大いに・多いに|おおいにooini[1]atamadaka (head-high)

1. adverbvery; very much; greatly; considerably; highly; exceedingly; a great deal; a lot; to one's heart's content
   私は彼かれを大おおいに尊敬そんけいしています。↗

   I have a great regard for him.

• Synonym誠にまことにFormalFormal and solemn; used chiefly in apologies and thanks, as in 「誠に申し訳ない」. 「大いに」 mostly modifies verbs, meaning to do something to the full.
• Synonym非常にひじょうにNeutralLeans written and objective; mostly modifies adjectives, as in 「非常に難しい」. 「大いに」 mostly modifies verbs.
• Synonym甚だはなはだWrittenWritten style meaning 'exceedingly'; often in negative evaluations, as in 「甚だ迷惑だ」. 「大いに」 mostly modifies actions and tends to have a more positive ring.
• SynonymよほどNeutralMeans 'quite/very' and often carries conjecture or a 'rather than…' nuance, as in 「よほど疲れたらしい」. 「大いに」 has no such conjectural sense.
• SynonymだいぶNeutralMeans 'considerably' and is mostly used for degrees of change, as in 「だいぶ慣れた」. 「大いに」 stresses doing something to the full.
• SynonymよくNeutralMeans 'well' or 'often'; in its degree sense it mostly modifies verbs, as in 「よく分かる」. 「大いに」 stresses great degree and doing things to the full.
• SynonymよっぽどCasualColloquial emphatic form of 「よほど」; means 'quite/very' and often carries a conjectural tone. 「大いに」 carries no such conjecture.
• Synonym大変たいへんNeutralCommon in daily speech; also works as a na-adjective. It modifies adjectives more than 「大いに」 does, as in 「大変おいしい」.
• SynonymずいぶんNeutralMeans 'quite/very' and often carries surprise or a reproachful tone, as in 「ずいぶん遅いね」. 「大いに」 has no such tone.
• SynonymごくNeutralMeans 'extremely', as in 「ごく普通」, and mostly modifies stative words. 「大いに」 mostly modifies actions.
• Synonym極めてきわめてWrittenWritten style meaning 'extremely', cool and formal in tone; mostly modifies adjectives. 「大いに」 mostly modifies actions and sounds less detached.
• SynonymたいそうNeutralMeans 'very' with an old-fashioned ring; as a na-adjective it suggests exaggeration or fanfare. 「大いに」 is the more current choice.
• Synonym実にじつにFormalThe same word as 「誠に」 above; solemnly means 'truly, very', chiefly in apologies and thanks, unlike the action-modifying 「大いに」.
• SynonymかなりNeutralMeans 'considerably' but falls short of 「大いに」 in degree; common in speech, as in 「かなり寒い」.
• Synonym至っていたってWrittenWritten style meaning 'exceedingly'; modifies states, as in 「至って元気」「至って深刻」. 「大いに」 mostly modifies actions, meaning to the full.
• SynonymいかにもNeutralMeans 'indeed, just as it looks'; stresses outward impression, as in 「いかにも高そうだ」. 「大いに」 only states degree.
• SynonymたっぷりNeutralMeans 'amply, to the brim', as in 「時間はたっぷりある」; stresses plentiful quantity. 「大いに」 is about degree.
• SynonymとてもNeutralThe most common everyday word for 'very'; mostly modifies adjectives. 「大いに」 mostly modifies verbs, as in 「大いに飲む」.
• SynonymひどくNeutralMeans 'terribly, severely' and is mostly for negative degrees, as in 「ひどく疲れる」. 「大いに」 tends to carry a positive sense.
• SynonymすこぶるWrittenWritten style meaning 'extremely', with an old-fashioned flavor, as in 「すこぶる元気」. 「大いに」 is more often used with actions.
• SynonymいともWrittenWritten style meaning 'extremely'; seen in 「いとも簡単に」「いともたやすく」 and mostly modifying adjectives. 「大いに」 mostly modifies actions.
• SynonymずんとWrittenAn uncommon adverb meaning 'markedly'; with a negative it means 'not at all'. Rare in modern usage; say 「ずいぶん」 in daily speech.
• SynonymどんとCasualColloquial; conveys boldness or a big amount all at once, and 「どんと構える」 means to stay calm and unshaken. 「大いに」 is about degree.
• SynonymぐっとNeutralMeans 'at once, markedly', as in 「ぐっと良くなる」; stresses how big a change is. 「大いに」 does not emphasize change.
• SynonymうんとCasualColloquial; means 'a lot, very much', as in 「うんと食べる」, with a hearty, free-and-easy flavor. 「大いに」 also fits formal settings.
• SynonymぐんとNeutralMeans 'markedly', as in 「ぐんと伸びる」; stresses the size of a change. 「大いに」 does not emphasize change.
• RelatedまったくNeutralWith a negative it means 'not at all, completely not'; opposite to 「大いに」 at the extremes of full degree versus none.
• Related最ももっともNeutralMeans 'most' and is used in superlative comparison, as in 「最も高い山」. 「大いに」 only states a high degree, with no comparison involved.
• Antonym少しもすこしもNeutralWith a negative it means 'not at all', the direct opposite of the 'greatly' of 「大いに」.

「大いに」 is for doing something to the full or doing it greatly, and it mostly modifies verbs. To modify adjectives, use 「とても」 or 「非常に」 instead. For a striking change, reach for 「ぐっと」 or 「ぐんと」; for a plentiful amount, 「たっぷり」. Standing opposite 「大いに」 is 「少しも」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 非常ひじょうに。甚はなはだ。