Wiseguy is a slang term used to describe someone who is cunning, shrewd, and intelligent. Antonyms for the word wiseguy include naive, innocent, simple, and foolish. A naive person lacks experience, judgment, or sophistication, while an innocent person is free from guilt, deception or corruption. A simple person has a straightforward and uncomplicated nature, while someone who is foolish lacks good sense or judgment. Using antonyms can help to refine your meaning and convey a more precise message when communicating. Knowing the key synonyms and antonyms for words can help you strengthen your writing skills and comprehension.