11 letters · 15 points in Scrabble
adjective untroubled by interference or disturbance
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 disturbed English undisturbed From un- + disturbed.
Etymology from Wiktionary, CC BY-SA 3.0