The Collaborative International Dictionary of English v.0.48:

Parsimonious \Par`si*mo"ni*ous\, a. [Cf. F. parcimonieux. See
   Parsimony.]
   Exhibiting parsimony; sparing in expenditure of money; frugal
   to excess; penurious; niggardly; stingy. --
   Par`si*mo"ni*ous*ly, adv. -- Par`si*mo"ni*ous*ness, n.
   [1913 Webster]

         A prodigal king is nearer a tyrant than a parsimonious.
                                                  --Bacon.
   [1913 Webster]

         Extraordinary funds for one campaign may spare us the
         expense of many years; whereas a long, parsimonious war
         will drain us of more men and money.     --Addison.
   [1913 Webster]

   Syn: Covetous; niggardly; miserly; penurious; close; saving;
        mean; stingy; frugal. See Avaricious.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

parsimoniousness \parsimoniousness\ n.
   1. The quality of being parsimonious; extreme care in
      spending money; reluctance to spend money unnecessarily.

   Syn: parsimony, thrift, penny-pinching.
        [WordNet 1.5]

   2. An extreme stinginess.

   Syn: meanness, minginess, niggardliness, niggardness,
        parsimony, tightfistedness.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

parsimoniousness
    n 1: extreme care in spending money; reluctance to spend money
         unnecessarily [syn: parsimony, parsimoniousness,
         thrift, penny-pinching]
    2: extreme stinginess [syn: meanness, minginess,
       niggardliness, niggardness, parsimony,
       parsimoniousness, tightness, tightfistedness,
       closeness]