The adjective 太い (meaning "thick/fat", JLPT N4) conjugates in the Past Negative Polite form as 太くなかったです (futokunakatta desu). Adjective type: i-adjective.
Context Example
この木は太くなかったです。
Kono ki wa futokunakatta desu.
This tree was not thick.
What is the Past Negative Polite conjugation of 太い (futoi)?
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