/ Thesaurus / U Synonyms of unsinkable Find synonyms for: Adjective1. unsinkable (vs. sinkable)usage: incapable of being sunk; "they thought the Titanic was unsinkable"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: entomology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language