Frumpiest is a word that describes someone or something as drab, unattractive or lacking in style. Its antonyms would be words that describe someone or something as fashionable, attractive or stylish. Some possible antonyms for frumpiest include chic, suave, refined, sophisticated, elegant, stylish, fashionable, trendy, and glamorous. These words convey a sense of confidence and sophistication, characterised by stylish clothing, trendy hairstyles, and well-groomed appearances. In contrast, frumpiest implies a lack of concern for style or fashion, and a preference for comfort over appearance. Overall, antonyms for frumpiest represent sleekness, grace, and attention to detail, while frumpiest suggests a lack of care and attention to one's appearance.