Etymology
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follies (n.)
"glamorous theatrical revue with lots of pretty girls," 1880, from French folies (mid-19c.), from folie (see folly), probably in its sense of "extravagance" (compare extravaganza).
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manic (adj.)

"pertaining to or affected with mania," 1902, from mania + -ic. The clinical term manic depressive also is from 1902; manic depression is first attested 1903. An older name for it was circular insanity (1857), from French folie circulaire (1854).

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folly (n.)
early 13c., "mental weakness; foolish behavior or character; unwise conduct" (in Middle English including wickedness, lewdness, madness), from Old French folie "folly, madness, stupidity" (12c.), from fol (see fool (n.)). From c. 1300 as "an example of foolishness;" sense of "costly structure considered to have shown folly in the builder" is attested from 1650s. But used much earlier, since Middle English, in place names, especially country estates, probably as a form of Old French folie in its meaning "delight." Related: Follies.
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