tested tes·ted UK/ˈtɛstɪd/ US/ˈtɛstɪd/ common adjective 1. tested and proved useful or correct “a tested method” Synonymstriedwell-tried Similarproved 2. tested and proved to be reliable Synonymstime-testedtriedtried and true Similarreliable WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.