The Collaborative International Dictionary of English v.0.48:

Immodesty \Im*mod"es*ty\, n. [L. immodestia: cf. F. immodestie.]
   Lack of modesty, delicacy, or decent reserve; indecency. "A
   piece of immodesty." --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

immodesty
    n 1: the trait of being vain and conceited [ant: modestness,
         modesty]
    2: the perverse act of exposing and attracting attention to your
       own genitals [syn: exhibitionism, immodesty]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "immodesty":
   aggressive self-confidence, boldness, brazenness, bumptiousness,
   chestiness, cockiness, conceit, conceitedness, exhibitionism,
   flagrancy, forwardness, impudicity, notoriousness, obtrusiveness,
   perkiness, pertness, self-assertiveness, self-conceit,
   shamelessness, side, swelled head, swelled-headedness,
   unembarrassedness, unmodestness