The word "unprepossessed" means not having an attractive appearance or lacking charm or grace. The antonym of "more unprepossessed" would be a word that describes something that is attractive or charming. Synonyms of this antonym include appealing, attractive, captivating, charming, delightful, enchanting, and lovely. In contrast to unprepossessed, these words imply beauty, grace, and charm, which are qualities that are considered desirable. The use of antonyms can help to add variety to your writing and to express different shades of meaning. Through the use of antonyms, we can describe things that are contrasting and different.