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improper 
1  adj Improper activities are illegal or dishonest. 
FORMAL 25 officers were investigated following allegations of improper conduct during the murder inquiry...  
 improperly  adv ADV with v 
I acted neither fraudulently nor improperly.  
2  adj Improper conditions or methods of treatment are not suitable or good enough for a particular purpose. 
FORMAL ADJ n  (=inappropriate) 
The improper use of medicine could lead to severe adverse reactions.  
 improperly  adv ADV with v 
The study confirmed many reports that doctors were improperly trained...  
3  adj If you describe someone's behaviour as improper, you mean that it is rude or shocking. 
OLD-FASHIONED, disapproval 
(=indecent) 

He would never be improper, he is always the perfect gentleman.