'Unseen' in the Bible

“Oh, that You would hide me in Sheol (the nether world, the place of the dead),That You would conceal me until Your wrath is past,That You would set a definite time and then remember me [and in Your lovingkindness imprint me on your heart]!

“But if I look to Sheol (the nether world, the place of the dead) as my home,If I make my bed in the darkness,

“Will my hope go down with me to Sheol (the nether world, the place of the dead)?Shall we go down together in the dust?”

“They fully enjoy their days in prosperity,And so go down to Sheol (the nether world, the place of the dead) in a [peaceful] moment.

For it is kept secret from the eyes of all living, unseen by the birds of the air.

His flesh wastes away to nothing,and his unseen bones stick out.