Green’s Dictionary of Slang

dumfoozled adj.

confused.

1845		W.T. Thompson Chronicles of Pineville 172: If I hadn’ta been completely dumfoozled, I’d never a killed Blaze like I did.
1859		Argus (Melbourne) 30 Apr. 4/6: [A] glossary is sometimes necessary to enable English readers to comprehend [...] American journals ! What, for example, is the meaning of ‘dod-derned’ and ‘dog-gone,’ of [...] ‘some pumpkins’? of ‘dreadful slick,’ ‘everlasting cus,’ [...] ‘planking-down,’ and ‘dumfoozled’?
1867		H.S. Melville Adventures of a Griffin 108: When the lens was about to be applied the poor dumfoozled savages held their noses very close that they might be satisfied there was no cheating.
1940		(con. mid–19C) J. Fiske Letters 264: But, good Lord, he is a young chap no older than I am! I was completely dumfoozled.