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How to Say ‘I drank quite a bit.’ in Japanese

けっこう飲んじゃったんです。

kekkou non jatsu ta n desu

[KEK-koh NOHN JAHT tah n dess]

💬 Usage Tip: 飲んじゃった is the casual sound of 飲んでしまった, adding a sense of "oops, I overdid it". 〜んです then frames it as an explanation for your symptoms.

Phrase Breakdown

けっこう

kekkou

[KEK-koh]

quite; fairly

Adverb meaning a considerable amount.

Example

けっこう遠いです。

It's quite far.

飲んじゃったんです。

non jatsu ta n desu

I (ended up) drinking

飲んじゃった is the casual form of 飲んでしまった, meaning 'drank (too much, with regret)'. Adding んです gives an explanation. Say non-jatta-n-desu, with a pause at the small っ.

Example

全部食べちゃったんです。

I ended up eating it all.

Words in this phrase

飲ん

non

[NOHN]

drink

Form of 飲む used before the te-ending で.

Example

水を飲んでください。

Please drink water.

じゃっ

jatsu

[JAHT]

(sadly) ended up; completely

Casual contraction of でしまう after verbs like 死ぬ, expressing regret that something happened.

Example

ケーキを全部食べちゃった。

I ended up eating all the cake.

た

[tah]

past tense ending

This ending completes the polite past tense form.

Example

空席がございました。

There were vacant seats.

ん

[n]

(explanatory n)

Casual form of の; adds a tone of seeking or giving an explanation, often before です.

Example

どうしたんですか。

What happened?

です

desu

[dess]

is; polite copula

A polite sentence ending used in formal conversation.

Example

少し伺いたいです。

I would like to ask a little.

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