The Collaborative International Dictionary of English v.0.48:

Improvidence \Im*prov"i*dence\, n. [L. improvidentia; OF.
   improvidence. Cf. Imprudence.]
   The quality of being improvident; lack of foresight or
   thrift.
   [1913 Webster]

         The improvidence of my neighbor must not make me
         inhuman.                                 --L'Estrange.
   [1913 Webster]

WordNet (r) 3.0 (2006):

improvidence
    n 1: a lack of prudence and care by someone in the management of
         resources [syn: improvidence, shortsightedness] [ant:
         providence]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "improvidence":
   brashness, brass, brazen boldness, cheek, chutzpah, fecklessness,
   gall, hastiness, heedlessness, heroics, hubris, imprudence,
   impudence, indiscretion, injudiciousness, insolence,
   lax stewardship, negligence, overboldness, overcarelessness,
   overconfidence, oversureness, overweeningness, poor husbandry,
   rashness, shiftlessness, temerariousness, temerity,
   thoughtlessness, thriftlessness, unchariness, unwariness



The Devil's Dictionary (1881-1906):

IMPROVIDENCE, n.  Provision for the needs of to-day from the revenues
of to-morrow.