Extremely partisan; extremely biased in favor of a political party.(adjective)
Sharply polarized by political parties in fierce disagreement with each other.(adjective)
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Use "hyperpartisan" in a sentence
"Log in to Reply well Kyle that "hyperpartisan" bickering during Clinton..."
"Pollster Mark DiCamillo of the Field Poll said the governor's action Thursday could call attention to the "hyperpartisan" divisions in the Democratic-controlled Legislature."
"Political analysts say all of this has led to a hyperpartisan political environment in Washington, one that former Senator Bob Bennett says he knows all too well."