extravagant

[Latin extr, outside; see extra- +
Latin vagr, to wander.]

•  adjective

1    spending or costing too much money:
?You've been terribly extravagant, buying all these presents.
?wild extravagant parties
2    unlikely to be true or really happen:
?extravagant claims that the drug cures AIDS
extravagantly adverb
extravagance noun [C,U]