'Fellow' in the Bible

Now David had said, "Surely {in vain} I guarded all that this fellow had in the desert. And nothing was missed of all that [was] his, but he returned evil against me in place of good!

But the commanders of [the] Philistines were angry with him and they said to him, "Send the man back so that he might return to his place where you have assigned him! But he will not go down with us into the battle, so that he does not become an adversary to us in the battle. By what could this fellow make himself favorable to his lord? Is it not with the heads of these men?