The antonyms for pre-historic are many, and they all describe different periods of time. Some of the most common antonyms include modern, contemporary, present-day, futuristic, and space-age. These words all refer to the here and now, or to the future, and are thus the opposite of prehistoric, which refers to the distant past. Other antonyms for prehistoric include advanced, evolved, sophisticated, and cultured. These words describe societies and civilizations that have progressed beyond the early stages of development, which is what pre-historic refers to. Ultimately, the antonyms for prehistoric reflect a broad range of human experiences and progress over time.