adjective, daffier, daffiest. Informal.
silly; weak-minded; crazy.

1880–85; daff (obsolete; see daff1) + -y1

daffily, adverb
daffiness, noun
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World English Dictionary
daffy (ˈdæfɪ)
adj , daffier, daffiest
informal daft another word for daft
[C19: from obsolete daff fool; see daft]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1884, perhaps from daft (q.v.), or from obs. daffe "halfwit" (cf. 15c. daffish), of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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