Not tiring; tireless.

characterized by hard work and perseverance[syn: hardworking ]

adjective

failing , irresolute , tiring , unpersevering

adjective

constant , continued , continuing , dedicated , devoted , dogged , eager beaver * , fireball , firm , go-go , grind * , hyper , incessant , indefatigable , indomitable , inexhaustible , jumping , patient , perky , persistent , pertinacious , plodding , plugging , resolute , staunch , steady , strong , tenacious , tireless , unceasing , undeterred , unfailing , unfaltering , unflagging , unflinching , unremitting , unstinted , unswerving , unwavering , unwearied , weariless , endless , everlasting , sustained , unwearying