Source : Webster's Revised Unabridged Dictionary (1913)

Extravagant \Ex*trav"a*gant\, a. [F. extravagant, fr. L. extra
   on the outside + vagans, -antis, p. pr. of vagari to wander,
   from vagus wandering, vague. See {Vague}.]
   1. Wandering beyond one's bounds; roving; hence, foreign.
      [Obs.]

            The extravagant and erring spirit hies To his
            confine.                              --Shak.

   2. Exceeding due bounds; wild; excessive; unrestrained; as,
      extravagant acts, wishes, praise, abuse.

            There appears something nobly wild and extravagant
            in great natural geniuses.            --Addison.

   3. Profuse in expenditure; prodigal; wasteful; as, an
      extravagant man. ``Extravagant expense.'' --Bancroft.

Extravagant \Ex*trav"a*gant\, n.
   1. One who is confined to no general rule. --L'Estrange.

   2. pl. (Eccl. Hist.) Certain constitutions or decretal
      epistles, not at first included with others, but
      subsequently made a part of the canon law.

Source : WordNet®

extravagant
     adj 1: unrestrained in especially feelings; "extravagant praise";
            "exuberant compliments"; "overweening ambition";
            "overweening greed" [syn: {excessive}, {exuberant}, {overweening}]
     2: recklessly wasteful; "prodigal in their expenditures" [syn:
        {prodigal}, {profligate}, {spendthrift}]