What is "incroyable"

Incroyable \In`croy`a"ble\, n. [F., lit., incredible.] A French fop or dandy of the time of the Directory; hence, any fop.

Note: The name is said to have been given in allusion not only to the extravagant dress, but also to the frequent use of the phrase ``C'est vraiment incroyable'' (That is really incredible.).

1796, from French incroyable, literally "incredible" (15c.), from in- "not, opposite of, without" (see in- (1)) + croire "to believe," from Latin credere (see credo). Name for the French fop or dandy of the period of the Directory (1795-99). Said to be so called from their extravagant dress and from a favorite expression among them ("C'est vraiment incroyable").