seeing your pure behavior in fear.
It is specifically the wife’s behavior in contrast to her speech that Peter said may be effective in winning an unsaved husband. "A word" includes preaching as well as the Word of God. Peter was not forbidding speaking to unsaved husbands about the Lord or sharing Scripture verses if the husband would be receptive to those. His point was simply that a godly wife’s conduct is going to be more influential than anything she may say. "Chaste" is a general term describing her purity while "respectful" reflects her attitude toward her husband that rises out of her attitude toward God’s will.