Superlative form of stubborn: most stubborn.(adjective)
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Use "stubbornest" in a sentence
"Probably the stubbornest are the small farmers and hillbillies who are perhaps the most individualistic inhabitants of North America."
"Now he's at it again, portraying one of the stubbornest, most isolated and cruelly treated figures in all of Shakespeare -- Shylock the moneylender -- in the Public Theater's sterling new staging of "The Merchant of Venice.""
"Unless you are a stubborn Dutchman -- and Jan Van Artevelde was the stubbornest Dutchman on Venus."