decapitated de·ca·pi·tated UK/dɪˈkæpɪteɪtəd/ US/diˈkæpʌˌteɪtɪd/ uncommon adjective 1. having had the head cut off “the beheaded prisoners” Synonymsbeheaded Similarheadless WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.