The adjective 速い (meaning "fast/quick", JLPT N4) conjugates in the Past Negative Polite form as 速くなかったです (hayakunakatta desu). Adjective type: i-adjective.
Context Example
車が速くなかったです。
Kuruma ga hayakunakatta desu.
The car was not fast.
What is the Past Negative Polite conjugation of 速い (hayai)?
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