The Collaborative International Dictionary of English v.0.48:

Turpitude \Tur"pi*tude\, n. [L. turpitudo, from turpis foul,
   base.]
   Inherent baseness or vileness of principle, words, or
   actions; shameful wickedness; depravity. --Shak.
   [1913 Webster] Turquoise

WordNet (r) 3.0 (2006):

turpitude
    n 1: a corrupt or depraved or degenerate act or practice; "the
         various turpitudes of modern society" [syn: depravity,
         turpitude]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "turpitude":
   abandon, abandonment, abjection, baseness, chicanery,
   corruptedness, corruption, corruptness, debasement, decadence,
   decadency, degeneracy, degenerateness, degeneration, degradation,
   demoralization, depravation, depravedness, depravity,
   dissoluteness, knavery, knavishness, moral pollution,
   moral turpitude, profligacy, rascality, rascalry, reprobacy,
   roguery, roguishness, rottenness, scampishness, scoundrelism,
   vileness, villainousness, villainy



Bouvier's Law Dictionary, Revised 6th Ed (1856):

TURPITUDE. Everything done contrary to justice, honesty, modesty or good
morals, is said to be done with turpitude.