Define egregious. egregious synonyms, egregious pronunciation, egregious translation, English dictionary definition of egregious. adj. Conspicuously bad or offensive. Something that is egregious stands out, but not in a good way — it means "really bad or offensive." If you make an egregious error during a championship soccer match, your coach might bench you for the rest of the game. Definition of egregious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Egregious means extremely bad in a way that is very noticeable. Learn how to use this formal adjective in sentences and find synonyms and related words in the Cambridge Dictionary.
