The English language is a vast ocean of words, and sometimes you might want to express something without being negative. Instead of using the term "most illbred" to express uncultured behavior, one can use antonyms such as refined, genteel, cultured or polished. These words reveal a positive image of someone who has good taste, manners and proper etiquette. By contrast, the term "most illbred" portrays negative connotations such as crude, unsophisticated, boorish or uncouth. Employing antonyms will enable you to express yourself clearly and without negative implications. In summary, using antonyms will make your language more polite and diplomatic.