cavalier ca·va·lier UK/ˌkævəˈlɪɚ/ US/ˈkæ.vəˌlir/ uncommon dated obsolete slang noun (2) adjective (1) noun 1. a gallant or courtly gentleman Synonymschevalier 2. a royalist supporter of Charles I during the English Civil War adjective 1. given to haughty disregard of others Synonymshigh-handed Similardomineering Related words Word family cavalierlycavalier hat Broader terms monarchistmale aristocrat WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.