13 letters · 25 points in Scrabble
adjective incapable of being justified or explained
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 justifiable English unjustifiable From un- + justifiable.
Etymology from Wiktionary, CC BY-SA 3.0