What is the word for an adult who is not mature?


What term can be used for an adult, especially a man, who is in his forties and still behaves like a teenager, shunning responsibilities typical of mature people, preferring to enjoy himself?



Answer



I would just call such a person immature, defined by The American Heritage Dictionary as:



adj. Marked by or suggesting a lack of normal maturity: silly, immature behavior.



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