Flea-bitten is an adjective used to describe a person, animal, or thing that is shabby, worn-out, or unkempt. Antonyms for flea-bitten include pristine, immaculate, flawless, polished, and spotless. These words are used to describe things that are new, clean, and in perfect condition. Other antonyms for flea-bitten include refined, elegant, sophisticated, and polished, which are used to describe people who are well-mannered, cultured, and graceful. Therefore, the context in which the word flea-bitten is used will determine the most appropriate antonym to be used.