Breadcrumb Home > Thesaurus > S Synonyms of sinkhole Find synonyms for: Noun 1. sinkhole, sink, swallow hole, natural depression, depression usage: a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of sinkhole (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: contretemps Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language