Wiktionary
                    uninstructive
                    
                        
                
                                                                    a. Not instructive.
WordNet
                    uninstructive
                    
                        
                
                                                                    - adj. not tending to inform or clarify; "an unenlightening comment" [syn: unenlightening, uninformative] [ant: enlightening] 
- not informative or enlightening [syn: uninformative] [ant: instructive] 
- not informative [syn: uninformative] [ant: informative] 
Usage examples of "uninstructive".
Nor is the spectacle altogether unentertaining and uninstructive, which the history of those times presents to us.
When Monsieur Leblanc was sober, he was a most excellent and well-informed tutor, although one apt to digress into many side issues, which in themselves were not uninstructive.