'Indeed' in the Bible

But God said, “No, Sarah your wife shall bear you a son indeed, and you shall name him Isaac (laughter); and I will establish My covenant with him for an everlasting covenant and with his descendants after him.

His brothers said to him, “Are you actually going to reign over us? Are you really going to rule and govern us as your subjects?” So they hated him even more for [telling them about] his dreams and for his [arrogant] words.