lazinessEnglishOxford English Thesauruslaziness noun idleness, indolence, slothfulness, sloth, shiftlessness, inactivity, inertia, sluggishness, lethargy, languor, torpidity, slowness, heaviness, dullness; remissness, negligence, slackness, laxity. ▷antonyms industriousness, energy.laziness Oxford Dictionary of English