Help me to make rewrite this sentence

[linhtho0211]

Please kindly help me to rewrite this sentence "He is not certainly stupid" with "means"
I tried very hard to look up the dictionary for a sentence like this but in vain.
I really hope that you can help me

 

[venu.mojo]

The structure of the sentence should be " He is certainly not stupid" which means that he is definitely not stupid.