Simple past tense and past participle of placard.(verb)
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Use "placarded" in a sentence
"The first taste usually comes from seeing your name placarded on a dead wall between some equally distinguished rolled oats and a new five-cent cigar."
"In the afternoon all the San Francisco specials were full of the incident, and Hamar, seeing his name placarded for the first time, was so overcome that he spent the rest of the evening in the hotel deliberating how he could best turn his sudden notoriety to account."
"It was, in its tri-lingual character, a sign of Israel's degradation and a flourishing of the whip in their faces, as a government order in English placarded in a Bengalee village might be, or a Russian ukase in Warsaw."