The adjective 便利 (meaning "convenient", JLPT N5) conjugates in the Past Negative Polite form as 便利じゃなかったです (benri janakatta desu). Adjective type: na-adjective.
Context Example
スマホは便利じゃなかったです。
Sumaho wa benri janakatta desu.
Smartphones were not convenient.
What is the Past Negative Polite conjugation of 便利 (benri)?
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