reasoned rea·so·ned UK/ˈriːzənd/ US/ˈɹiːzn̩d/ uncommon adjective 1. reflects weight of sound argument or evidence “a sound argument” Synonymssoundwell-grounded Similarvalid 2. resulting from careful thought “the paper was well thought out” Synonymsconsideredwell thought out Similarthoughtful WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.