9 letters · 16 points in Scrabble
adjective situated at or extending to great depth; too deep to have been sounded or plumbed; ; -Thomas Gray
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 plumbed English unplumbed From un- + plumbed.
Etymology from Wiktionary, CC BY-SA 3.0