The adjective 丁寧 (meaning "polite", JLPT N4) conjugates in the Past Negative Polite form as 丁寧じゃなかったです (teinei janakatta desu). Adjective type: na-adjective.
Context Example
彼の日本語は丁寧じゃなかったです。
Kare no nihongo wa teinei janakatta desu.
His Japanese was not polite.
What is the Past Negative Polite conjugation of 丁寧 (teinei)?
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