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