1. 
2. 
[syn: ill-considered, ill-judged, improvident, shortsighted]
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]
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]
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