Simple past tense and past participle of trifle.(verb)
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Use "trifled" in a sentence
"A worthy henchman, as indignant as was _Sam Weller_ when he found his beloved master's name trifled with, writes to ask me, "Ain't nobody to be whopped for takin 'this here liberty, Sir?""
"He was sure they must have 'trifled' a great deal, or they would have accomplished more than they had."
"He was sure they must have "trifled" a great deal, or they would have accomplished more than they had."