The Collaborative International Dictionary of English v.0.48:

Profligacy \Prof"li*ga*cy\, n. [See Profligate, a.]
   The quality of state of being profligate; a profligate or
   very vicious course of life; a state of being abandoned in
   moral principle and in vice; dissoluteness.
   [1913 Webster]

WordNet (r) 3.0 (2006):

profligacy
    n 1: the trait of spending extravagantly [syn: extravagance,
         prodigality, profligacy]
    2: dissolute indulgence in sensual pleasure [syn: profligacy,
       dissipation, dissolution, licentiousness, looseness]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "profligacy":
   carnality, corruption, debauchery, degeneracy, depravity,
   dissipation, dissoluteness, eroticism, evil, excess, exorbitance,
   extravagance, immorality, improvidence, indecency, lasciviousness,
   lavishness, lechery, lewdness, libertinism, licentiousness,
   perversion, prodigality, promiscuity, recklessness, sensuality,
   sin, sinfulness, squandering, sybaritism, unrestraint, vice,
   voluptuousness, wantonness, waste, wastefulness, wickedness