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 ... More @Wikipedia
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