Pre*ten"tious*ness

from The Collaborative International Dictionary of English v.0.48

Pretentious \Pre*ten"tious\, a. [Cf. F. pr['e]tentieux. See
   {Pretend}.]
   Full of pretension; disposed to lay claim to more than is
   one's; presuming; assuming. -- {Pre*ten"tious*ly}, adv. --
   {Pre*ten"tious*ness}, n.
   [1913 Webster]