Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

   Syn: Inconsiderable; negligent; careless; shiftless;
        prodigal; wasteful.

Source : WordNet®

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}, {shortsighted}]