guaranteed gua·ran·teed UK/ˌɡæ.ɹənˈtiːd/ US/ˌɡɛrʌˈntid/ fairly common adjective 1. secured by written agreement Synonymsbondedsecuredwarranted Similarsecure WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.