Improvident

from WordNet (r) 3.0 (2006)

improvident
    adj 1: not provident; not providing for the future [ant:
           {provident}]
    2: not given careful consideration; "ill-considered actions
       often result in disaster"; "an ill-judged attempt" [syn:
       {ill-considered}, {ill-judged}, {improvident},
       {shortsighted}]

from The Collaborative International Dictionary of English v.0.48

Improvident \Im*prov"i*dent\, a. [Pref. im- not + provident: cf.
   L. improvidus. See {Provident}, and cf. {Imprudent}.]
   Not provident; wanting foresight or forethought; not
   foreseeing or providing for the future; negligent;
   thoughtless; as, an improvident man.
   [1913 Webster]

         Improvident soldiers! had your watch been good,
         This sudden mischief never could have fallen. --Shak.

   Syn: Inconsiderable; negligent; careless; shiftless;
        prodigal; wasteful.
        [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

46 Moby Thesaurus words for "improvident":
      brash, brazen, brazenfaced, careless, extravagant, feckless,
      grasshopper, happy-go-lucky, headlong, heedless, hubristic,
      impetuous, imprudent, impudent, impulsive, incautious, indiscreet,
      injudicious, insolent, lavish, negligent, overbold, overcareless,
      overconfident, oversure, overweening, prodigal, profligate,
      profuse, rash, reckless, shiftless, short-sighted, spendthrift,
      temerarious, thoughtless, thriftless, unchary, uneconomical,
      unmindful, unproviding, unthinking, unthoughtful, unthrifty,
      unwary, wasteful