The Collaborative International Dictionary of English v.0.48:

Expensive \Ex*pen"sive\, a.
   1. Occasioning expense; calling for liberal outlay; costly;
      dear; liberal; as, expensive dress; an expensive house or
      family.
      [1913 Webster]

            War is expensive, and peace desirable. --Burke.
      [1913 Webster]

   2. Free in expending; very liberal; especially, in a bad
      sense: extravagant; lavish. [R.]
      [1913 Webster]

            An active, expensive, indefatigable goodness.
                                                  --Sprat.
      [1913 Webster]

            The idle and expensive are dangerous. --Sir W.
                                                  Temple.

   Syn: Costly; dear; high-priced; lavish; extravagant. --
        Ex*pen"sive*ly, adv. -- Ex*pen"sive*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

expensiveness
    n 1: the quality of being high-priced [ant: inexpensiveness]