Of plant and animal products, esp. fruit: not yet ripe, not mature.

Half ripe. Obsolete. rare.

Esp. of grain or fruit: not ripened, unripe. Also in figurative contexts. Now chiefly Indian English.

Coming before the proper or natural time; premature. Of fruit. Also, not fully or properly ripened; immature.

Not ripened; unripe.

Ripened too long; too ripe.

Of a fruit: unripe.

Usually of fruit: mellow, soft; esp. overripe.

(under-, prefix1 affix 5(c).)

Too ripe (in various senses of the adjective); (esp. of fruit, etc.) advanced in development beyond the stage of maturity or ripeness. Also figurative…