The Collaborative International Dictionary of English v.0.48:

Expensefull \Ex*pense"full\, a.
   Full of expense; costly; chargeable. [R.] --Sir H. Wotton. --
   Ex*pense"ful*ly, adv. [R.] -- Ex*pense"ful*ness, n. [R.]
   [1913 Webster]