The Collaborative International Dictionary of English v.0.48:

Flamboyant \Flam*boy"ant\, a. [F.] (Arch.)
   Characterized by waving or flamelike curves, as in the
   tracery of windows, etc.; -- said of the later (15th century)
   French Gothic style.
   [1913 Webster]

WordNet (r) 3.0 (2006):

flamboyant
    adj 1: marked by ostentation but often tasteless; "a cheap showy
           rhinestone bracelet"; "a splashy half-page ad" [syn:
           flamboyant, showy, splashy]
    2: elaborately or excessively ornamented; "flamboyant
       handwriting"; "the senator's florid speech" [syn: aureate,
       florid, flamboyant]
    n 1: showy tropical tree or shrub native to Madagascar; widely
         planted in tropical regions for its immense racemes of
         scarlet and orange flowers; sometimes placed in genus
         Poinciana [syn: royal poinciana, flamboyant, flame
         tree, peacock flower, Delonix regia, Poinciana
         regia]

Moby Thesaurus II by Grady Ward, 1.0:

105 Moby Thesaurus words for "flamboyant":
   Gongoresque, Johnsonian, affected, arabesque, baroque, bedazzling,
   bedizened, big-sounding, blinding, bright, bright and shining,
   brilliant, busy, chichi, convoluted, dashing, dazzling,
   declamatory, decorated, effulgent, elaborate, elegant, elevated,
   embellished, euphuistic, extravagant, fancy, fine, flaming, flashy,
   flaunting, florid, flowery, frilly, fulgent, fulgid, fulsome,
   fussy, garish, gaudy, glaring, glary, grandiloquent, grandiose,
   grandisonant, high, high-flowing, high-flown, high-flying,
   high-sounding, high-wrought, highfalutin, inkhorn, jaunty, labored,
   labyrinthine, lexiphanic, lofty, lurid, luscious, luxuriant,
   luxurious, magniloquent, meretricious, moresque, ornamented,
   ornate, orotund, ostentatious, overdone, overelaborate,
   overelegant, overinvolved, overlabored, overworked, overwrought,
   peacockish, peacocky, pedantic, picturesque, pompous, pretentious,
   pretty-pretty, rakish, refulgent, resplendent, rhetorical, rich,
   rococo, sensational, sensationalistic, sententious, showy,
   sonorous, splashy, splendent, splendid, splendorous, stilted,
   swank, swashbuckling, tall, tortuous, vivid, wide