Breadcrumb Home > Thesaurus > U Synonyms of ultima thule Find synonyms for: Noun1. Thule, ultima Thuleusage: the geographical region believed by ancient geographers to be the northernmost land in the inhabited worldWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: solecism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language