The Collaborative International Dictionary
                    Unadvisable
                    
                        
                
                                                                    Unadvisable \Un`ad*vis"a*ble\, a.
   Not advisable; inadvisable; inexpedient. 
--Lowth. --
    Un`ad*vis"a*bly, adv.
Wiktionary
                    unadvisable
                    
                        
                
                                                                    a. 1 inadvisable. 2 (context archaic English) Unwilling to take advice. 3 (context archaic English) imprudent.
WordNet
                    unadvisable
                    
                        
                
                                                                    adj. not prudent or wise; not recommended; "running on the ice is inadvisable" [syn: inadvisable] [ant: advisable]
Usage examples of "unadvisable".
Lady Southdown, I think it would be quite unadvisable to commence so early upon serious topics with Miss Crawley.