Breadcrumb Home > Thesaurus > E Cite Synonyms of ex post facto Find synonyms for: Adjective1. ex post facto, retroactive, retro, retrospective (vs. prospective)usage: affecting things past; "retroactive tax increase"; "an ex-post-facto law"; "retro pay"WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved. TrendingHere are the facts and trivia that people are buzzing about. February 2021 Current Events: US News The Berlin Conference and the Partition of Africa The Implied Powers of Congress The Women's March on Versailles Keeping Your Brain Active in a COVID-19 World The Manchu Related Content Daily Word Quiz: oleaginous Analogy of the Day: Today?s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language