The adjective 遅い (meaning "slow/late", JLPT N4) conjugates in the Past Negative Polite form as 遅くなかったです (osokunakatta desu). Adjective type: i-adjective.
Context Example
返事が遅くなかったです。
Henji ga osokunakatta desu.
The reply was not slow.
What is the Past Negative Polite conjugation of 遅い (osoi)?
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