1. An immature adult male who lacks the emotional or social maturity expected of his age
   "His refusal to do household chores or manage finances made him seem like a manchild";
   - man-child [informal]

1. [archaic] A child who is male
   "The proud parents announced the birth of their man-child";
   - male offspring

Type of: child, kid [informal], male, male person

Encyclopedia: Manchild