Answer: tireless

AnswerCrossword Clue
TIRELESSIndefatigable
TIRELESSUnflagging
TIRELESSIndefatigable.
TIRELESSEver energetic
TIRELESSEnergetic
TIRELESSLike a junkyard car
TIRELESSLike many a junkyard car
tirelessuntiring; indefatigable
tirelessuntiring (not tiring)