Simple past tense and past participle of dun.(verb)
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Use "dunned" in a sentence
""dunned" for half-a-year's board, though that would have been no new item in his well-patched-up experience."
"I read actual books see ... and if I weren't an independant thinker, I'd likely still be a motherfriekin 'mormon (may their "temples" burn, may they loose their tax status and be dunned for many decades of back taxes ... that would pay off the deficit!)"
"She sounded like she was repeating something that had been dunned into her again and again, and seemed bamboozled over that bit of pink stone!"