/ Thesaurus / U Synonyms of undiagnosed Find synonyms for: Adjective1. undiagnosed, unknown (vs. known)usage: eluding diagnosis; "undiagnosed disease"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language