Simple past tense and past participle of slur.(verb)
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Use "slurred" in a sentence
"She came toward me and began speaking in slurred speech."
"The only problem was that Martini had received a diagnosis of Parkinson's disease, inviting the prospect of another pontificate ending in slurred speech and trembling hands."
"The first, in slurred Spanish, kept calling me "Jefe" (chief), a distancing form of address to say the least (think of "amigo" as a way of including someone and you'll see what I mean)."