13 letters · 18 points in Scrabble
adjective impossible to recover or recoup or overcome
originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in- Latin ir- English ir- English retrieve 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 retrievable English irretrievable From ir- + retrievable.
Etymology from Wiktionary, CC BY-SA 3.0