Simple past tense and past participle of plagiarise.(verb)
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Use "plagiarised" in a sentence
"And in response to the Writing metapuzzle, greenlily provoked me into writing a piece of terrible McShep SGA fanfiction, badly plagiarised from the first chapter of The DaVinci Code."
"Alexander Dumas, glorious authors, whom I delight to read save in my amorous correspondence, where a feminine mistake in orthography gives me more pleasure than a phrase plagiarised from George Sand, or a pathetic tirade stolen from a popular dramatist."
"Apparently it's plagiarised from a Mayan ritual chant - well, it's awesome."