/ Thesaurus / B Synonyms of burden of proof Find synonyms for: Noun1. burden of proof, duty, responsibility, obligationusage: the duty of proving a disputed chargeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language