1A conjunction meaning 'however' or 'but', used to introduce content that contrasts with what came before; common in both speech and writing, with a slightly formal tone.
彼は努力した。しかし結果は伴わなかった。
He worked hard. However, the results didn't follow.
説明は分かった。しかし実行するのは難しい。
I understood the explanation, but putting it into practice is difficult.
この店の料理は安い。しかし味はとてもいい。
The food at this restaurant is cheap. However, it tastes really good.
天気予報は晴れです。しかし山では風が強いかもしれません。
The forecast says sunny. However, it might be windy in the mountains.