'Stealthily' in the Bible

David’s men said to him, “Behold, this is the day of which the Lord said to you, ‘Behold, I will hand over your enemy to you, and you shall do to him as seems good to you.’” Then David arose [in the darkness] and stealthily cut off the hem (edge) of Saul’s robe.

David rose and stealthily cut off the corner of Saul's robe. Afterwards, David's conscience bothered him because he had cut off the corner of Saul's robe.