Meaning

noun a disinclination to work or exert yourself

noun any of several slow-moving arboreal mammals of South America and Central America; they hang from branches back downward and feed on leaves and fruits

noun apathy and inactivity in the practice of virtue (personified as one of the deadly sins)

originFrom Middle English slouthe, slewthe (“laziness”), from Old English slǣwþ (“sloth, indolence, laziness, inertness, torpor”), from Proto-West Germanic *slaiwiþu, from Proto-Germanic *slaiwiþō (“slowness, lateness”), equivalent to slow + -th (abstract nominal suffix). Cognate with Scots sleuth (“sloth, slowness”).

Etymology from Wiktionary, CC BY-SA 3.0