A person who holds views associated with the political left.(noun)
Of or pertaining to the political left.(adjective)
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Use "leftist" in a sentence
"[JT Davis]: You don't even know what a leftist is anymore ..."
"Horowitz has long opposed what he calls the leftist orthodoxy that rules American higher education, calling out professors who, he says, attempt to indoctrinate rather than inform."
"Mr. Lugo becomes the latest in a series of Latin American leftist leaders."