The Collaborative International Dictionary of English v.0.48:

Profligate \Prof"li*gate\, a. [L. profligatus, p. p. of
   profligare to strike or dash to the ground, to destroy; pro
   before + a word akin to fligere to strike. See Afflict.]
   [1913 Webster]
   1. Overthrown; beaten; conquered. [Obs.]
      [1913 Webster]

            The foe is profligate, and run.       --Hudibras.
      [1913 Webster]

   2. Broken down in respect of rectitude, principle, virtue, or
      decency; openly and shamelessly immoral or vicious;
      dissolute; as, profligate man or wretch.
      [1913 Webster]

            A race more profligate than we.       --Roscommon.
      [1913 Webster]

            Made prostitute and profligate muse.  --Dryden.
      [1913 Webster]

   Syn: Abandoned; corrupt; dissolute; vitiated; depraved;
        vicious; wicked. See Abandoned.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Profligate \Prof"li*gate\, n.
   An abandoned person; one openly and shamelessly vicious; a
   dissolute person. "Such a profligate as Antony." --Swift.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Profligate \Prof"li*gate\, v. t.
   To drive away; to overcome.

   Note: [A Latinism] [Obs.] --Harvey.
         [1913 Webster]

WordNet (r) 3.0 (2006):

profligate
    adj 1: recklessly wasteful; "prodigal in their expenditures"
           [syn: extravagant, prodigal, profligate,
           spendthrift]
    2: unrestrained by convention or morality; "Congreve draws a
       debauched aristocratic society"; "deplorably dissipated and
       degraded"; "riotous living"; "fast women" [syn: debauched,
       degenerate, degraded, dissipated, dissolute,
       libertine, profligate, riotous, fast]
    n 1: a dissolute man in fashionable society [syn: rake,
         rakehell, profligate, rip, blood, roue]
    2: a recklessly extravagant consumer [syn: prodigal,
       profligate, squanderer]