It means that they are so heedless of sexual defilements...

It means that they are so heedless of sexual defilements that as if they are not at all aware of it. For sometimes the attitude of a person toward sin is in a way that thought of sin goes out of his mind, as if there were not existed at all such an action. This is the supreme grade of piety. Another possibility is that the purpose of /qafilat/ is the women who are not aware of the unjust accusations attributed to them; therefore, they do not defend themselves. So, this verse…