12 letters · 18 points in Scrabble
adjective not to be placated or appeased or moved by entreaty
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 appeasable English unappeasable From un- + appeasable.
Etymology from Wiktionary, CC BY-SA 3.0