Breadcrumb Home > Thesaurus > I Synonyms of impermeable Find synonyms for: Adjective 1. impermeable (vs. permeable), retentive, water-repellent, water-resistant, impervious#1, imperviable, tight usage: preventing especially liquids to pass or diffuse through; "impermeable stone"; "an impermeable layer of scum"; "a coat impermeable to rain" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of impermeable (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: jactation Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language