unripe (adj.)youdaoicibaDictYouDict[unripe 词源字典]
Old English unripe "premature" (in reference to death), from un- (1) "not" + ripe (adj.). Meaning "immature, not fully developed (of fruit, etc.) is recorded from mid-13c. Similar formation in Middle Dutch onrijp, Old High German unrifi, German unreif.[unripe etymology, unripe origin, 英语词源]