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What is a one-word term to describe a man who still acts like a child or immature?

For example:

Steve just laughed at the word "shuttlecock". He's such a {man who acts like a child}

closed as off-topic by sumelic, Mick, user66974, user140086, tchrist Dec 20 '16 at 9:12

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I've heard the term "man-child" used a lot in this context. Not sure if hyphenated still meets your single word request though

  • It would be great if you could add some references to your answer. – Helmar Dec 20 '16 at 8:43
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Well, it looks you have answered the question yourself.

The world Childlike fits your description

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