More celebrious is a term used to describe something that is classy, distinguished or illustrious. To find antonyms for this word we need to look for words that convey the opposite meaning. Words that come to mind include inferior, lowly, obscure, unknown, and undistinguished. These words convey a similar meaning to 'less celebrious' and can be used to describe things that are not as noteworthy, important or prestigious. While these words may not be as flattering as 'more celebrious', they can still be useful in expressing a different sense of meaning in your language.