What is an antonym for bozo?

There isn't one perfect antonym for "bozo" because it's a slang term with a negative connotation. However, depending on the context, here are some possible antonyms:

Formal:

* Genius

* Scholar

* Expert

* Mastermind

Informal:

* Smart guy/gal

* Brains

* Sharp

* Savvy

You could also use words that emphasize intelligence, competence, or wisdom to contrast with the implication of foolishness in "bozo."