Source : Webster's Revised Unabridged Dictionary (1913)

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

            War is expensive, and peace desirable. --Burke.

   2. Free in expending; very liberal; especially, in a bad
      scene; extravagant; lavish. [R.]

            An active, expensive, indefatigable goodness.
                                                  --Sprat.

            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.

Source : WordNet®

expensively
     adv : in an expensive manner; "an expensively dressed little man
           turned a corner and approached her" [ant: {cheaply}]