Harnda
Here is the word dumb in hawiian Leo pa'a, mumule.
"I sure am - I'm struck dumb by how ugly you are." Struck dumb means momentarily speechless, which you can explain to the people calling you dumb because I can tell they're to dumb to get it. Or, if you want to keep with the times, you can say, "Your face is dumb."
No, I would say it is an adjective.
The oldest simile for 'as dumb as' is 'As dumb as a doornail'. Others include: As dumb as a wet noodle. As dumb as an unpowered computer. As dumb as a library with no books.
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