Not flagging; untiring. See Synonyms at tireless .

showing sustained enthusiastic action with unflagging vitality; "an indefatigable advocate of equal rights"; "a tireless worker"; "unflagging pursuit of excellence"[syn: indefatigable ]

unceasing; "unfailing loyalty"; "unfailing good spirits"; "unflagging courtesy"[syn: unfailing ]

adjective

changing , inconstant , variable , wavering

adjective

active , assiduous , constant , diligent , dynamic , energetic , fixed , indefatigable , inexhaustible , persevering , staunch , steady , tireless , unceasing , undeviating , unfailing , unfaltering , unrelenting , unremitting , unretiring , untiring , unwearied , weariless , determined , firm , steadfast