don't know: Who did it? I dunno!
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How to use dunno in a sentence
Republicans should, I dunno, get behind a law that supports that, doncha think?
When I asked him, he just smiled, said, "I dunno Marty, I just knew."
I dunno's I'd know when t' jar loose m'self, if I knowed her an' she didn't object t' me hangin' around.Raw Gold | Bertrand W. Sinclair
"I dunno but you're right," observed Redmond after a pause, during which he keenly scrutinized the young agent's face.Mystery Ranch | Arthur Chapman
"I dunno but I'd ruther have the wuth on 't," said Mrs. John C., as she had said many times before.Country Neighbors | Alice Brown
British Dictionary definitions for dunno
(I) do not know
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012