the.com/silliness

Intelligence taking a day off and leaving the building unlocked.

means Behavior that's deliberately foolish, frivolous, or absurd — fun without the burden of seriousness.

from From 'silly,' which has one of the great reversal stories in English: it started as 'sely' or 'saelig,' meaning blessed, happy, or fortunate — related to the German 'selig' (blissful). Over centuries it drifted from blessed to innocent, then to pitiable, then to simple-minded, and finally landed on foolish. So 'silliness' is etymologically a fall from grace — a word that used to mean favored by God and ended up meaning goofing around with a lampshade on your head.

etymology
once meant blessed or holy in old English
function
lowers stakes enough for honesty to sneak in
paradox
requires real wit to fake convincingly
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