不衰的,不屈不撓的,不鬆弛的
unflagging adj 1: showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence" [syn: {indefatigable}, {tireless}, {unwearying}] 2: unceasing; "unfailing loyalty"; "unfailing good spirits"; "unflagging courtesy" [syn: {unfailing}]