Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Silly; foolish.
  • adjective Crazy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective a little crazy

Etymologies

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

[From obsolete daff, fool, from Middle English daffe; probably akin to dafte, foolish; see daft.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From daff +‎ -y.

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