Source : Webster's Revised Unabridged Dictionary (1913)

Unadvised \Un`ad*vised"\, a.
   1. Not prudent; not discreet; ill advised. --Shak.

   2. Done without due consideration; wanton; rash;
      inconsiderate; as, an unadvised proceeding. --
      {Un`ad*vis"ed*ly}, adv. -- {Un`ad*vis"ed*ness}, n.

Source : WordNet®

unadvised
     adj 1: without careful prior deliberation or counsel; "ill-advised
            efforts"; "it would be ill-advised to accept the
            offer"; "took the unadvised measure of going public
            with the accusations"; "ill-advised efforts" [syn: {ill-advised}]
            [ant: {well-advised}]
     2: having received no information; "a defendant unadvised of
        her legal rights"