/ Thesaurus / U Synonyms of under that Find synonyms for: Adverb1. thereunder, under that, under itusage: under that; "the headings and the items listed thereunder"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language