ex·trav·a·gant 
(ĭk-străvə-gənt)
(ĭk-străvə-gənt)adj.
1.
a. Exceeding reasonable bounds: extravagant demands. See Synonyms at excessive.
b. Unreasonably high in cost; exorbitant: extravagant fees.
c. Lavish or imprudent in spending money: extravagant members of the imperial court.
2. Extremely abundant; profuse: extravagant vegetation.
3. Archaic Straying beyond limits or bounds; wandering.
[Middle English, unusual, rambling, from Old French, from Medieval Latin extrāvagāns, extrāvagant-, present participle of extrāvagārī, to wander : Latin extrā, outside; see EXTRA- + Latin vagārī, to wander.]
ex·trava·gant·ly adv.