/ Thesaurus / I Synonyms of illustriously Find synonyms for: Adverb1. illustriouslyusage: in an illustrious manner; "Einstein, the illustriously famous physicist of the 20th century"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language