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daftness

adjective, daft·er, daft·est.

senseless, stupid, or foolish.
insane; crazy.
Scot. merry; playful; frolicsome.

adjective mainly British

informal foolish, simple, or stupid
a slang word for insane
informal (postpositive foll by about) extremely fond (of)
slang frivolous; giddy

adj.

Old English gedæfte “gentle, becoming,” from Proto-Germanic *gadaftjaz (cf. Old English daeftan “to put in order, arrange,” gedafen “suitable;” Gothic gadaban “to be fit”), from PIE *dhabh- “to fit together.” Sense progression from “mild” (c.1200) to “dull” (c.1300) to “foolish” (mid-15c.) to “crazy” (1530s) probably was influenced by analogy with daffe “halfwit.”