When it comes to describing a smart boy, there are a plethora of synonyms to choose from. He could be referred to as intelligent, bright, gifted, insightful, perceptive, sharp-witted, quick-thinking, astute, knowledgeable, or even brainy. A smart boy might also be described as clever, sharp, wise, shrewd, or even sagacious. These words all suggest a high level of intellect, but they can also convey different nuances. For instance, perceptive implies sensitivity to details, whereas astute suggests a shrewd understanding of situations. Whatever term one chooses, a smart boy is undoubtedly someone worth admiring and respecting for their intellectual abilities.