Unthankfulness, which tends to make them unreconcilable and unrecoverable.
Details were unrecoverable, but the emotions in which they were embedded moved.
It is difficult, this conjuring with the unrecoverable past, so rashly done by us all.
He had done it, and assured me that he didn't regret his lost youth or sigh after its unrecoverable pleasures.
Living criticism, genuine ...