1) Callow 2) Green 3) Immature 4) Like a green banana 5) Like green bananas 6) Like most green tomatoes 7) Like red blackberries 8) Like some green tomatoes 9) Needing more time on the vine 10) Not fully developed or mature 11) Not fully matured 12) Not fully prepared 13) Not ready for picking 14) Not ready to be picked 1) Green 2) Immature 3) Unaged 4) Unprepared 5) Unready 6) Unripened 
• (a.) Developing too early; premature. • (a.) Not ripe; as, unripe fruit.
[adj] - not fully prepared
adjective not fully prepared
not ripe; immature; not fully developed: unripe fruit. · too early; premature.