Source : Webster's Revised Unabridged Dictionary (1913)

Unripe \Un*ripe"\, a.
   1. Not ripe; as, unripe fruit.

   2. Developing too early; premature. --Sir P. Sidney.

Source : WordNet®

unripe
     adj 1: not fully developed or mature; not ripe; "unripe fruit";
            "fried green tomatoes"; "green wood" [syn: {green}, {unripened},
             {immature}] [ant: {ripe}]
     2: not fully prepared