Insusceptible of reform:
— Irredeemable sinners.

synonyms: irreclaimable, unredeemable, unreformable.

Roget 859: hopeless, desperate, despairing, gone, in despair, au desespoir [Fr.], forlorn, desolate; inconsolable etc. (dejected) 837; broken hearted.    unpromising, unpropitious; inauspicious, ill-omened, threatening, clouded over.    out of the question, not to be thought of; impracticable etc. 471; past hope, past cure, past mending, past recall; at one's last gasp etc. (death) 360; given up, given over.    incurable, cureless, immedicable, remediless, beyond remedy; incorrigible; irreparable, irremediable, irrecoverable, irreversible, irretrievable, irreclaimable, irredeemable, irrevocable; ruined, undone; immitigable.    ... show more

of paper money Not convertible into coin at the pleasure of the holder.