Breadcrumb Home > Thesaurus > U Synonyms of undersea Find synonyms for: Adjective 1. submarine, undersea, subsurface (vs. overhead) (vs. surface) usage: beneath the surface of the sea WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of undersea (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: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language