だいぶ・大分daibu[0]heiban (flat)

1. adverbconsiderably; greatly; a lot
   だいぶ痛いたみがなくなりました。↗

   The pain has mostly gone away.

• Synonym大いにおおいにWrittenWritten/formal prose word for 'greatly', as in 「大いに楽しむ」「大いに反省する」; it modifies actions, while 「だいぶ」 stresses that the degree is already considerable.
• SynonymよほどCasualColloquial; means 'considerably', but also marks conjecture, as in 「よほど疲れたのだろう」.
• SynonymよっぽどCasualThe colloquial spoken form of 「余程」, pronounced よっぽど; means 'considerably' or 'very nearly', as in 「よっぽど嬉しかった」.
• Synonym誠にまことにFormalFormal; means 'truly, really', used chiefly in formal apologies and thanks, as in 「誠に申し訳ない」.
• Synonym非常にひじょうにNeutralNeutral but leaning formal; means 'very', a higher degree than 「だいぶ」.
• SynonymかなりNeutralNeutral; means 'considerably, quite' at much the same degree as 「だいぶ」, but with a more objective tone.
• SynonymずいぶんCasualColloquial; means 'considerably, very', and can also carry reproach, as in 「随分ひどい」.
• Synonym甚だはなはだWrittenWritten/formal prose; means 'very', often in negative contexts, as in 「甚だ遺憾」.
• SynonymたいそうWrittenWritten/formal prose; means 'very' but can also suggest exaggeration, as in 「大層な口を利く」.
• Synonym実にじつにFormalThe same word 「誠に」 as above (「実に」 is one of its spellings); formal 'truly, really', chiefly in solemn thanks and apologies, unlike 「だいぶ」's plain 'considerably'.
• Synonym至っていたってWrittenWritten/formal prose; means 'very' and modifies states, as in 「至って元気」「至って簡単」, with a calm, measured tone.
• SynonymぐっとCasualColloquial; means 'in one go' or 'much more', as in 「ぐっと良くなる」— it highlights a marked change.
• SynonymうんとCasualColloquial; means 'a lot, very much', as in 「うんと食べる」.
• SynonymすこぶるWrittenWritten/formal prose; means 'extremely' with an old-fashioned ring, as in 「すこぶる元気」.
• Synonym著しくいちじるしくWrittenWritten/formal prose; means 'remarkably, markedly', as in 「著しく向上する」.
• Related思い切りおもいきりCasualColloquial; means to do something to the full or with all one's strength, as in 「思い切り遊ぶ」— the point is holding nothing back.
• Related最ももっともWrittenWritten/formal prose; the superlative 'most', marking the highest degree in a comparison, whereas 「だいぶ」 states a considerable degree with no comparison.
• Related優にゆうにWrittenWritten/formal prose; means 'fully, easily (as many as)', as in 「優に百人を超える」.
• RelatedぎょうさんCasualColloquial Kansai dialect for 'a lot', as in 「ぎょうさんある」; can also mean exaggerated.
• RelatedおおきにCasualOld-fashioned colloquial or Kansai dialect for 'very much'; as 「おおきに」 it is a casual 'thanks a lot'.
• RelatedずんとCasualOld-fashioned colloquial; means 'considerably, markedly', and with a negative it means 'not at all'.
• RelatedどんとCasualColloquial; means 'heaps of' or 'with full force', as in 「どんと構える」.
• AntonymわずかNeutralAn antonym of 「だいぶ」; means 'only a little', as in 「わずかな差」.
• Antonym少しすこしNeutralAn antonym of 「だいぶ」; means 'a little', as in 「少し寒い」.

Use 「だいぶ」 by default for 'considerably, a lot'. For about the same degree with an objective tone, pick 「かなり」; for 'very', use 「非常に」. In written prose say 「大いに」 or 「甚だ」. When a change is striking, 「ぐっと」 fits; for 'no less than' amounts use 「優に」. For small amounts use 「少し」 or 「僅か」. The rest are narrower: 「思い切り」「うんと」「どんと」 add colloquial force, 「誠に」 is formal politeness, and 「最も」 marks the top of a comparison.

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

1. 想定そうていしていた数量すうりょうや程度ていどが多大ただいであること。相当そうとう。かなり。