Here is Torrance on what the language of curse means in the Bible:

. . . let us be clear about what the curse of God means. When the Bible speaks of curse, it means that the cursed is no longer within but without, outside the covenant of God. Without the covenant relation with God man is condemned to exist as one who does not belong to it, but is an outsider. Curse means the reprobation of the elect, the casting away of those whom God has made and loves; it means separation from the face of God, banishment from creation into outer darkness. That is what Paul calls the act of God in giving mankind up to their own uncleanness and to their own reprobate mind, to their own self destruction. Cursing does not mean annihilation, the sending of the cursed into nothingness, into the nihil out of which man and woman were created, but a banishment to their own denial of their being in God, that is, into the very darkness upon which God has for ever turned his back in creation on the cross. (T. F. Torrance, Incarnation, 251)

They will be punished with everlasting destruction and shut out from the presence of the Lord and from the majesty of his power 10. on the day he comes to be glorified in his holy people and to be marveled at among all those who have believed. . . . II Thessalonians 1:9, 10a

As Torrance notes, “outer darkness” is a place that is reserved for those whom reject their ‘election’ in Christ; and instead, realize their abysmal condemnation in the chasm ripped open at the cross — that is in the ‘chasm’ signified by: “My God, my God, why hast thou forsaken me?” This so called chasm is shaped by the inward curving of humanity upon itself; life realized as non-life, forever separated from the bosom of the One who is a se (life from self), and reaping the consequences of dying in a self-possessed life.