13 letters · 19 points in Scrabble
adjective insusceptible of reform
originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in-bor. Middle English in- English ir- English reclaim 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 reclaimable English irreclaimable From ir- + reclaimable.
Etymology from Wiktionary, CC BY-SA 3.0