shortest shor·test UK/ˈʃɔːtɪst/ US/ˈʃɔɹtɪst/ uncommon adjective 1. most direct “took the shortest and most direct route to town” Synonymsshort Similardirect WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.