General Opposites:
* A well-behaved boy: This directly contrasts the wildness and lack of discipline.
* A tame boy: This emphasizes the lack of untamed energy and impulsiveness.
* A docile boy: This highlights obedience and gentleness.
* A civilized boy: This emphasizes social graces and proper manners.
More Specific Opposites:
* A studious boy: If "wild boy" implies a lack of focus or interest in academics.
* A gentle boy: If "wild boy" suggests a rough or boisterous personality.
* A quiet boy: If "wild boy" implies a boisterous or loud personality.
Opposite in terms of Nature:
* A domesticated boy: This emphasizes the opposite of a "wild" nature.
The best opposite depends on the specific context and the intended meaning of the phrase "a wild boy."