Meaning

adjective insusceptible of reform

adjective (of paper money) not convertible into coin at the pleasure of the holder

originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in- Latin ir- English ir- English redeem Proto-Indo-European *-tḗr Proto-Indo-European *-dʰlom Proto-Indo-European *-dʰlis Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English redeemable English irredeemable From ir- + redeemable.

Etymology from Wiktionary, CC BY-SA 3.0