12 letters · 17 points in Scrabble
adjective not admitting of pardon
originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English pardonable English unpardonable From un- + pardonable.
Etymology from Wiktionary, CC BY-SA 3.0