The risen saints will be immortal in both senses, unlike Adam in innocence
From this one can see how the first man's immortality in the state of integrity differs from the immortality the just will have after the blessed resurrection.
After the resurrection the saints will not be mortal in any way. They will not only be free from the necessity of dying; they will be altogether unable to die, or to bring death or mortality on themselves by sinning. So they will be immortal in both senses: they will not only be able not to die, they will be unable to die, and death will never have any power over them.
Latin
IV. Unde colligi potest discrimen inter immortalitatem primi hominis in statu integritatis, & illam quae competet justis post beatam resurrectionem. Nam Sancti post resurrectionem nullo modo mortales erunt: nec enim solum immunes erunt a necessitate moriendi, sed prorsus mori non poterunt, & peccando mortem aut mortalitatem incurrere. Et ita immortales erunt utroque modo, quia non solum poterunt non mori, sed mori non poterunt, & mors non poterit unquam ullam in eos habere potestatem.