Definition of "ungrown" [ungrown]

• Not grown; immature. (adjective)

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• "Zooey breaks up with bozo cheat durr-brain boyfriend, needs new room, moves in rather unaccountably with three ungrown males – what's happening to us men?"
• "I think of our (thankfully!) past president and see the dire, worldwide damage caused by one ungrown little boy."
• "Then my mind cleared, I saw things as they really were and not as my sick heart painted them, and I said bitterly, What, we two ungrown youths track down a murderer?"