How to Say ‘I didn’t notice.’ in Japanese
気づきませんでした。
kizuki mase n deshi ta
[kee-zoo-kee mah-seh n deh-shee tah]
💬 Usage Tip: Useful “repeat offender” moment: you can respond with [実は、前にも…] to show it’s recurring.
🇯🇵 In Japan: This phrase often aims to de-escalate. Even if you’re frustrated, acknowledging it politely helps resolution.
Phrase Breakdown
気づき
kizuki
[kee-zoo-kee]
noticed; realized; became aware (stem of 気づく)
The verb 気づく means “to notice/realize.” The stem 気づき is used before auxiliaries like ます/ませんでした.
音が大きいことに気づきませんでした。
I didn’t notice the music/sound was loud.
ませ
mase
[mah-seh]
(part of) polite negative form
ませ attaches to a verb stem to form the polite negative (ません). Here it’s part of 気づきませんでした “didn’t notice.”
ご迷惑に気づきませず、申し訳ありません。
I’m sorry I didn’t notice I was causing trouble.
ん
n
[n]
not (polite negative ending)
ん completes ませ to make ません, the polite negative ending meaning “do not / did not.”
夜遅くまでうるさいと気づきませんでした。
I didn’t realize it was noisy until late at night.
でし
deshi
[deh-shee]
(part of) “was” in polite past
でし is part of でした, the polite past form of です. With ませんでした it forms the polite negative past.
うるさかったとは気づきませんでした。
I didn’t realize it was loud.
た
ta
[tah]
past ending “-ta”
た completes でした to mark past tense. In ませんでした it means “did not … (in the past).”
ご迷惑をおかけしたとは気づきませんでした。
I didn’t realize I was causing you trouble.
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