13 letters · 17 points in Scrabble
noun a garment worn under other garments
adjective unsuitable or forbidden as a topic of conversation
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 mentionable English unmentionable From un- + mentionable.
Etymology from Wiktionary, CC BY-SA 3.0