11 letters · 13 points in Scrabble
adjective not capable of being changed or altered
adjective of a sentence; that cannot be changed
adjective remaining the same for indefinitely long times
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 alterable English unalterable From un- + alterable.
Etymology from Wiktionary, CC BY-SA 3.0