The term "unripe" refers to something that is not yet mature or developed. Its antonyms are "ripe" and "mature," which are used to describe things that are fully developed or ready for use, consumption, or maturity. These antonyms signify the difference between something that is expected to mature or grow but hasn't yet and something that has fully developed or reached its potential. Ripe fruits and vegetables are rich in nutrients and flavors, while mature ideas and actions reflect wisdom, experience, and expertise. Thus, the antonyms of "unripe" evoke the importance of growth, development, and attainment, be it in nature, knowledge, or life experiences.