/ Thesaurus / G Synonyms of ground sloth Find synonyms for: Noun1. ground sloth, megathere, megatherian, megatheriid, megatherian mammalusage: gigantic extinct terrestrial sloth-like mammal of the Pliocene and Pleistocene in AmericaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: fortuitous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language