14th century, in the meaning defined at sense 1
Middle English daffte, daft, defte "well-mannered, gentle, dull, foolish," going back to Old English gedæfte "gentle, mild, meek," adjective derivative of a Germanic base *daƀ- "becoming, fit" (whence also Old English gedafen "appropriate, fitting," Gothic gadaban "to happen, be suitable," with lengthened grade Old English gedēfe "fitting, worthy, quiet, tranquil," Middle Dutch onghedoef "wild, rough," Gothic gadob ist "it is fitting"), going back to dialectal Indo-European *dhabh- or *dhobh-, whence also Old Church Slavic podobati "to become, be fitting," dobrŭ "good, pleasant," Serbian/Croatian/Bosnian dôba, dȍba "time, season," Lithuanian dabà "nature, character," dabnùs "well-dressed, elegant"
Note: The sense progression from Germanic to Modern English is apparently "fit, becoming" to "well-mannered, modest" to "dull, stupid" to "foolish, irrational." See also deft.
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daft
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adjective