Synonyms for Illustrious (same or very similar meaning)
WordNet sense 1 (having or worthy of pride):
redoubtable, respectedWordNet sense 2 (widely known and esteemed):
celebrated, famed, famous, notable, noted, renowned, far-famedWordNet sense 3 (apprehended with certainty):
knownWordNet sense 4 (having or deserving or conferring glory):
gloriousFrom the ODE community, based on WordNetadd/edit