unflagging

Synonyms

indefatigable, inexhaustible, tireless, untiring, weariless;

Near Antonyms

indolent, lackadaisical, laggard, lazy, listless, shiftless, slothful, sluggish;

apathetic, casual, desultory, languid, spiritless;

beat, broken, burned-out (or burnt-out), done in, drained, enervated, jaded, overtaxed, overworked, played out, sapped, spent, tuckered (out), wearied, worn-out;

Related Words

assiduous, conscientious, diligent, meticulous, painstaking, sedulous;

determined, dogged, patient, persevering, persistent, pertinacious, plodding, relentless, steadfast, steady, stubborn, tenacious, unabated, unfailing, unfaltering, unflinching, unrelenting, unremitting, unwavering;

industrious, intense, laborious, slavish, strenuous;