/ Thesaurus / U Synonyms of undated Find synonyms for: Adjective1. dateless, undated, undatable (vs. datable)usage: not bearing a date; "a dateless letter"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