8 letters · 9 points in Scrabble
adjective characterized by hard work and perseverance
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 tiring English untiring From un- + tiring.
Etymology from Wiktionary, CC BY-SA 3.0