folly UK /ˈfɒli/US /ˈfɑli/noun 4verb 1forms 3 noun4 •Foolishness that results from a lack of foresight or lack of practicality.It would be folly to walk all that way, knowing the shops are probably shut by now. •Thoughtless action resulting in tragic consequence.The purchase of Alaska from Russia was termed Seward's folly. •A fanciful building built for purely ornamental reasons.A luncheonette in the shape of a coffee cup is particularly conspicuous, as is intended of an architectural duck or folly. •A clump of trees, particularly one on the crest of a hill (or sometimes on a stretch of open ground).'Every hill seems to have a Folly' [...] 'I mean a clump of trees on the top.' — 1880 verb1 •(dialect) To follow."Anybody got the makin's?" he said. "That's one hell of a thick bunch of canvas, but I follied the seam." — 2002 formsfollied · follying · follies