The adjective 真面目 (meaning "serious/earnest", JLPT N3) conjugates in the Past Negative Polite form as 真面目じゃなかったです (majime janakatta desu). Adjective type: na-adjective.
Context Example
あの生徒は真面目じゃなかったです。
Ano seito wa majime janakatta desu.
That student was not serious.
What is the Past Negative Polite conjugation of 真面目 (majime)?
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