Classicistic is a term that refers to adhering to the principles of classicism or classical art, architecture, and literature. The antonyms for 'most classicistic' would be words that refer to the opposite of classicism or classical forms. For instance, the term modernistic, which is a completely opposite term to classicistic, refers to adhering to the principles of modernism or the modern styles of art, literature, and architecture. Also, the word innovative could be used as an antonym for classicistic as it suggests something that follows modern, new, and unconventional ideas. In contrast, the term antique otherwise implies something that follows a traditional, old-fashioned, or outdated design or style.