Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Informal Silly; foolish.
  • adj. Informal Crazy.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. a little crazy

Etymologies

From obsolete daff, fool, from Middle English daffe; probably akin to dafte, foolish; see daft.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From daff +‎ -y. (Wiktionary)

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