Antonyms for the word "over-ripe" are "under-ripe" and "green." These terms are used to describe fruits and vegetables that are not yet fully developed, and therefore not yet suitable for eating. Under-ripe fruits and vegetables are characterized by their firmness, as well as their lack of sweetness or sourness. Some examples of under-ripe fruits include green bananas, hard avocados, and sour apples. Similarly, green vegetables are those that are still maturing and have not yet reached their full potential. Examples of green vegetables include unripe tomatoes, raw broccoli, and green beans. Overall, the antonyms for "over-ripe" emphasize the importance of waiting for fruits and vegetables to fully ripen before consuming them for optimal taste and nutritional value.