baptized bap·ti·zed UK/ˈbæptaɪzd/ US/ˈbæˌptaɪzd/ fairly common adjective 1. having undergone the Christian ritual of baptism Synonymsbaptised Antonymsunbaptized WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.