11 letters · 15 points in Scrabble
adjective having little desire for success or achievement
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 ambitious English unambitious From un- + ambitious.
Etymology from Wiktionary, CC BY-SA 3.0