Of unclear or uncertain meaning; incomprehensible or nonsensical — used when something cannot be understood or its intent is unclear.
彼の説明は専門用語が多くて意味不明だった。
His explanation had a lot of technical terms and was incomprehensible.
このメッセージは文字化けしていて意味不明だ。
This message is garbled and incomprehensible.
そのグラフのラベルがなくて、データの意味が不明だ。
The graph has no labels, so the meaning of the data is unclear.