prudery

from WordNet (r) 3.0 (2006)

prudery
    n 1: excessive or affected modesty [syn: {primness},
         {prudishness}, {prudery}, {Grundyism}]

from The Collaborative International Dictionary of English v.0.48

Prudery \Prud"er*y\, n.; pl. {Pruderies}. [F. pruderie. See
   {Prude}.]
   The quality or state of being prudish; excessive or affected
   scrupulousness in speech or conduct; stiffness; coyness.
   --Cowper.
   [1913 Webster]