Synonyms for annul Found 13 synonyms across 2 meanings for “annul”. declare invalid (verb) invalidatequashvoidavoidnullify cancel officially (verb) revokeliftcountermandreverserepealoverturnrescindvacate Explore Related Words Rhymes with annulSynonyms for invalidateSynonyms for quashSynonyms for voidSynonyms for avoidSynonyms for nullify Synonym Finder | Rhyme Finder | Poetry Editor