9 letters · 11 points in Scrabble
adjective (of theories etc) incapable of being defended or justified
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 tenable English untenable From un- + tenable.
Etymology from Wiktionary, CC BY-SA 3.0