The Collaborative International Dictionary of English v.0.48:

Licentious \Li*cen"tious\ (-sh[u^]s), a. [L. licentiosus: cf. F.
   licencieux. See License.]
   1. Characterized by license; passing due bounds; excessive;
      abusive of freedom; wantonly offensive; as, a licentious
      press.
      [1913 Webster]

            A wit that no licentious pertness knows. --Savage.
      [1913 Webster]

   2. Unrestrained by law or morality; lawless; immoral;
      dissolute; lewd; lascivious; as, a licentious man; a
      licentious life. "Licentious wickedness." --Shak.
      [1913 Webster]

   Syn: Unrestrained; uncurbed; uncontrolled; unruly; riotous;
        ungovernable; wanton; profligate; dissolute; lax; loose;
        sensual; impure; unchaste; lascivious; immoral.
        [1913 Webster] -- Li*cen"tious*ly, adv. --
        Li*cen"tious*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

licentious
    adj 1: lacking moral discipline; especially sexually
           unrestrained; "coarse and licentious men"

Moby Thesaurus II by Grady Ward, 1.0:

91 Moby Thesaurus words for "licentious":
   abandoned, amoral, animal, carnal, corrupt, debauched, depraved,
   disobedient, dissipated, dissolute, fast, fleshly, free,
   free-living, gallant, gay, go-go, headstrong, heady, high-living,
   hubristic, immoderate, immoral, incontinent, indulgent,
   insubordinate, intemperate, irrepressible, irresponsible,
   lascivious, lawless, lax, lecherous, lewd, libertine, libidinous,
   loose, lustful, mutinous, nonrestrictive, out of control,
   out of hand, oversexed, permissive, presuming, presumptuous,
   profligate, rakehell, rakehellish, rakehelly, rakish, rampant,
   randy, reinless, relaxed, reprobate, riotous, salacious, satyric,
   scabrous, self-willed, sensual, unaccountable, unbridled,
   unchecked, uncoerced, uncompelled, unconstrained, uncontrolled,
   uncurbed, undisciplined, unforced, ungoverned, uninhibited,
   unmastered, unmeasured, unmoral, unmuzzled, unprincipled, unreined,
   unrepressed, unreserved, unrestrained, unrestrictive, unruly,
   unsubdued, unsuppressed, wanton, wild, wildcat, willful