/ Thesaurus / R Synonyms of responsibleness Find synonyms for: Noun1. responsibility, responsibleness, trustworthiness, trustinessusage: a form of trustworthiness; the trait of being answerable to someone for something or being responsible for one's conduct; "he holds a position of great responsibility"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language