Source : Webster's Revised Unabridged Dictionary (1913)

Imprudent \Im*pru"dent\, a. [L. imprudens; pref. im- not +
   prudens prudent: cf. F. imprudent. See {Prudent}, and cf.
   {Improvident}.]
   Not prudent; wanting in prudence or discretion; indiscreet;
   injudicious; not attentive to consequence; improper. --
   {Im*pru"dent*ly}, adv.

         Her majesty took a great dislike at the imprudent
         behavior of many of the ministers and readers.
                                                  --Strype.

Source : WordNet®

imprudently
     adv : in an imprudent manner; "imprudently, he downed tools and
           ran home to make his wife happy" [ant: {prudently}]