he's not provably stupid.

That debatable

3 results for: provably
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Dictionary.com Unabridged (v 1.0.1) - Cite This Source new!
prove /pruv/ Pronunciation Key - Show Spelled Pronunciation[proov]
Pronunciation Key - Show IPA Pronunciation verb, proved, proved or prov?en,
prov?ing.

-verb (used with object) 1. to establish the truth or genuineness of, as by
evidence or argument: to prove one's claim.
2. Law. to establish the authenticity or validity of (a will);
probate.
3. to give demonstration of by action.
4. to subject to a test, experiment, comparison, analysis, or the
like, to determine quality, amount, acceptability, characteristics, etc.: to
prove ore.
5. to show (oneself) to have the character or ability expected of one,
esp. through one's actions.
6. Mathematics. to verify the correctness or validity of by
mathematical demonstration or arithmetical proof.
7. Also, proof. Printing. to take a trial impression of (type, a cut,
etc.).
8. to cause (dough) to rise to the necessary lightness.
9. Archaic. to experience.
-verb (used without object) 10. to turn out: The experiment proved to be
successful.
11. to be found by trial or experience to be: His story proved false.
12. (of dough) to rise to a specified lightness: Leave covered until
it has proved.