10 letters · 15 points in Scrabble
adjective not damaged or diminished in any respect
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 impaired English unimpaired From un- + impaired.
Etymology from Wiktionary, CC BY-SA 3.0