The dead are conscience though, right? Even before the resurrection of the dead.
Paul Before Felix
But this I admit to you, that according to the Way which they call a sect I do serve the God of our fathers, believing everything that is in accordance with the Law and that is written in the Prophets; having a hope in God, which these men cherish themselves, that there shall certainly be a resurrection of both the righteous and the wicked.
— Acts 24:14-15
Matthew Henry's Commentary
(Acts 24:15): “I have hope towards God, all my expectation is from him, and therefore all my desire is towards him and all my dependence upon him; my hope is towards God and not towards the world, towards another world and not towards this. I depend upon God and upon his power, that there shall be a resurrection of the dead at the end of time, of all, both the just and unjust; and the great thing I aim at in my religion is to obtain a joyful and happy resurrection, a share in the resurrection of the just.” Observe here, [1.] That there shall be a resurrection of the dead, the dead bodies of men, of all men from the beginning to the end of time. It is certain, not only that the soul does not die with the body, but that the body itself shall live again; we have not only another life to live when our present life is at an end, but there is to be another world, which shall commence when this world is at an end, into which all the children of men must enter at once by a resurrection from the dead, as they entered into this, one after another, by their birth. [2.] It shall be a resurrection both of the just and of the unjust, the sanctified and the unsanctified, of those that did well, and to them our Saviour has told us that it will be a resurrection of life; and of those that did evil, and to them that it will be a resurrection of condemnation, John 5:29. See Dan. 12:2. This implies that it will be a resurrection to a final judgment, by which all the children of men will be determined to everlasting happiness or misery in a world of retribution, according to what they were and what they did in this state of probation and preparation. The just shall rise by virtue of their union with Christ as their head; the unjust shall rise by virtue of Christ’s dominion over them as their Judge.
There are at least 3 passage which indicate that the unrighteous experience some kind of conscious existence after death.
Isaiah 14:9-14
(9) Sheol beneath is stirred up to meet you when you come; it rouses the shades to greet you, all who were leaders of the earth; it raises from their thrones all who were kings of the nations.
(10) All of them will answer and say to you: ‘You too have become as weak as we! You have become like us!’
(11) Your pomp is brought down to Sheol, the sound of your harps; maggots are laid as a bed beneath you, and worms are your covers.
(12) “How you are fallen from heaven, O Day Star, son of Dawn! How you are cut down to the ground, you who laid the nations low!
(13) You said in your heart, ‘I will ascend to heaven; above the stars of God I will set my throne on high; I will sit on the mount of assembly in the far reaches of the north;
(14) I will ascend above the heights of the clouds; I will make myself like the Most High.’
Ezekiel 32:20-22
(20) They shall fall amid those who are slain by the sword. Egypt is delivered to the sword; drag her away, and all her multitudes.
(21) The mighty chiefs shall speak of them, with their helpers, out of the midst of Sheol: ‘They have come down, they lie still, the uncircumcised, slain by the sword.’
(22) “Assyria is there, and all her company, its graves all around it, all of them slain, fallen by the sword,
Ezekiel 32:31
(31) “When Pharaoh sees them, he will be comforted for all his multitude, Pharaoh and all his army, slain by the sword, declares the Lord GOD.
Ezekiel 32:20-22
(20) They shall fall amid those who are slain by the sword. Egypt is delivered to the sword; drag her away, and all her multitudes.
(21) The mighty chiefs shall speak of them, with their helpers, out of the midst of Sheol: ‘They have come down, they lie still, the uncircumcised, slain by the sword.’
(22) “Assyria is there, and all her company, its graves all around it, all of them slain, fallen by the sword,
Ezekiel 32:31
(31) “When Pharaoh sees them, he will be comforted for all his multitude, Pharaoh and all his army, slain by the sword, declares the Lord GOD.
Luke 16:22-30
(22) The poor man died and was carried by the angels to Abraham's side. The rich man also died and was buried,
(23) and in Hades, being in torment, he lifted up his eyes and saw Abraham far off and Lazarus at his side.
(24) And he called out, ‘Father Abraham, have mercy on me, and send Lazarus to dip the end of his finger in water and cool my tongue, for I am in anguish in this flame.’
(25) But Abraham said, ‘Child, remember that you in your lifetime received your good things, and Lazarus in like manner bad things; but now he is comforted here, and you are in anguish.
(26) And besides all this, between us and you a great chasm has been fixed, in order that those who would pass from here to you may not be able, and none may cross from there to us.’
(27) And he said, ‘Then I beg you, father, to send him to my father's house—
(28) for I have five brothers—so that he may warn them, lest they also come into this place of torment.’
(29) But Abraham said, ‘They have Moses and the Prophets; let them hear them.’
(30) And he said, ‘No, father Abraham, but if someone goes to them from the dead, they will repent.’