From The Collaborative International Dictionary of English v.0.48 :
Unripened \Unripened\
See ripened.
From WordNet (r) 3.0 (2006) :
unripened
adj 1: not fully developed or mature; not ripe; "unripe fruit";
"fried green tomatoes"; "green wood" [syn: green,
unripe, unripened, immature] [ant: mature,
ripe]