Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

pretentiousness
     n 1: lack of elegance as a consequence of being pompous and
          puffed up with vanity [syn: {ostentation}, {ostentatiousness},
           {pomposity}, {pompousness}, {splashiness}, {inflation}]
     2: the quality of being pretentious (creating a false
        appearance of great importance or worth) [syn: {pretension}]
        [ant: {unpretentiousness}]