Breadcrumb Home > Thesaurus > I Synonyms of immensity Find synonyms for: Noun 1. enormousness, grandness, greatness, immenseness, immensity, sizeableness, vastness, wideness, largeness, bigness usage: unusual largeness in size or extent or number WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of immensity (Dictionary) ✖ Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language