Ha-Sad-Nun

To be guarded, be inaccessible/unapproachable, be chaste, be strongly fortified, difficult to access, be preserved, be protected (against attack), abstain from what is not lawful nor decorous, preserve or guard a thing in places inaccessible/unapproachable, make or render a thing inaccessible or unapproachable or difficult to access, make/render a thing unattainable by reason of its height, to fortify oneself.