mindmap root((不倦)) indefatigable implies persistent or unremitting activity or effort: an ~ champion of women’s rights. tireless implies a remarkable energy or stamina: honored as a teacher of ~ industry and limitless patience. untiring implies the extraordinary ability to go on continuously and without interruption: ~ researchers who fight against the disease. unwearied stresses the apparent absence of any sign of fatigue in the person or thing concerned: detectives remain ~ in their search for the killer. unflagging stresses the absence of any diminution or relaxation in one’s efforts or powers: an ~ attention to detail.