大いに
ōi ni[o̞ːi ɲ̟i]
The Japanese phrase for "very much" is 大いに (ōi ni).
大いに is used to mean "to a very great extent". It is typically used for positive or constructive intensifications, such as saying something was "greatly enjoyed" or "greatly improved", rather than being used for simple quantities or negative amounts.
Meaning: to a very great extent (adv)
Which one should you use?
While 大いに means "very much" or "greatly", it differs from other intensifiers in its focus on constructive or positive contexts.
Is there a formal and an informal way to say it?
大いに is more formal and literary than the colloquial way to say "very much", which would be much more common in daily conversation. In formal situations, you might use 大変 to express a high degree of intensity or hardship. For informal, colloquial or youthful speech, mainly in the Kansai region, you can use めっちゃ to emphasize excitement or intensity.
How does it change in a sentence?
大いに functions as an adverb and typically precedes a verb to modify its intensity.
How do you pronounce it?
ōi ni
Did you know?
- The word めっちゃ is believed by some linguists to be a corrupted version of めちゃくちゃ, which means 'messy' or 'in a state of chaos'.
- While 大いに is used for positive things, the word 大変 can mean both 'very' and 'terrible'. It is often used to describe a situation that is 'very' difficult or a 'huge' disaster.
- The word 大いに is actually a leftover piece of an old adjective, 大い, which is no longer used in its original form in modern daily conversation.
Examples in context
- 申（もう）し訳（わけ）ありませんが、大変（たいへん）混（こん）んでいます。I'm sorry, but it's very crowded.
- その映画（えいが）めっちゃ面白（おもしろ）かったよ！That movie was really interesting!
- このケーキはすごくおいしかったです！This cake was very delicious!
- 今日（きょう）のコンサート、マジで最高（さいこう）だったよ！Today's concert was seriously amazing!
- 昨日（きのう）のパーティー、めちゃくちゃ楽（たの）しかったね！Yesterday's party was so much fun!
- 大いに楽しんでください。Ooi ni tanoshinde kudasai.Please enjoy yourself very much.
- 今回の成功は大いに喜ばれます。Konkai no seikou wa ooi ni yorokobaremasu.This success will be very much celebrated.
- 彼は大いに期待されています。Kare wa ooi ni kitai sarete imasu.He is very much expected to succeed.
Example conversation
Two friends are discussing a upcoming music festival.
- 陽葵 Himari今度のフェスは大いに楽しもうね。Kondo no fesu wa ooi ni tanoshimou ne.Let's enjoy the next festival very much.
- 蓮 Ren賛成だ。最高の思い出にしよう。Sansei da. Saikou no omoide ni shiyou.I agree. Let's make it the best memory.
- 陽葵 Himari蓮はどのアーティストが楽しみ？Ren wa dono ātisuto ga tanoshimi?Ren, which artist are you looking forward to?
- 蓮 Renやっぱりメインのバンドが一番楽しみだよ。Yappari mein no bando ga ichiban tanoshimi dayo.As expected, I'm most looking forward to the main band.
Sources
- Pronunciation: Wiktionary entry 大いに, CC BY-SA 4.0, dump of 2026-09-26.
- Word origins: Wiktionary entries 大いに, CC BY-SA 4.0.
