Annihilationism is the belief that the final fate of the damned is complete destruction of their souls. In other words, non-being.
Verses in the Bible that seem to support this view include Romans 6:
20 For when you were slaves of sin, you were free from righteousness. 21 But what profit did you get then from the things of which you are now ashamed? For the end of those things is death. 22 But now that you have been freed from sin and have become slaves of God, the benefit that you have leads to sanctification, and its end is eternal life. 23For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord.
According to the Annihilationist understanding, death as here described is not “conscious, eternal suffering.”
Another verse cited by Annihilationsists is Matthew 10:28
“And do not be afraid of those who kill the body but cannot kill the soul; rather, be afraid of the one who can destroy both soul and body in Gehenna.”
There is also 1 John 5:17, the classic Catholic citation for the distinction of mortal and venial sin: “All wrongdoing is sin, but there is sin that is not deadly.”
The Catechism of the Catholic Church has a number of passages that, to me, don’t clearly undercut the notion that souls lacking in sanctifying grace die.
*1861 Mortal sin is a radical possibility of human freedom, as is love itself. It results in the loss of charity and the privation of sanctifying grace, that is, of the state of grace. If it is not redeemed by repentance and God’s forgiveness, it causes exclusion from Christ’s kingdom and the eternal death of hell, for our freedom has the power to make choices for ever, with no turning back. *
1035 The teaching of the Church affirms the existence of hell and its eternity. Immediately after death the souls of those who die in a state of mortal sin descend into hell, where they suffer the punishments of hell, "eternal fire."615 The chief punishment of hell is eternal separation from God, in whom alone man can possess the life and happiness for which he was created and for which he longs.
Of course, the Catechism also cites Bible verses that suggest that there is a resurrection of those who are not saved:
1038 The resurrection of all the dead, “of both the just and the unjust,” [CITATION: Acts 24:15] will precede the Last Judgment. This will be “the hour when all who are in the tombs will hear [the Son of man’s] voice and come forth, those who have done good, to the resurrection of life, and those who have done evil, to the resurrection of judgment.”[CITATION: Jn 5:28-29] Then Christ will come “in his glory, and all the angels with him … Before him will be gathered all the nations, and he will separate them one from another as a shepherd separates the sheep from the goats, and he will place the sheep at his right hand, but the goats at the left… and they will go away into eternal punishment, but the righteous into eternal life.” [CITATION: Mt 25:31, 32, 46.]
Has this issue been taught definitively?