rancor ran·cor UK/ˈɹæ̞ŋkə/ US/ˈɹæ̝ŋkɚ/ rare archaic rare us noun 1. a feeling of deep and bitter anger and ill-will Synonymsresentmentbitternessgallrancour Related words Word family gallresent Broader terms hostility Narrower terms heartburningsulkinessgrudgeenvy WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.