Yes, green bananas are unripe.
Typically, bananas are harvested while still green and unripe. This is because it makes them easier to transport and allows them to ripen gradually upon arrival at their destination. A green banana indicates that the ripening process has not yet completed. As bananas ripen, their color changes from green to yellow, and their starch converts to sugar, resulting in a sweeter and softer fruit. Therefore, a green banana is, by definition, unripe.
