Inconsiderate

in·con·sid·er·ate    (ĭn'kən-sĭd'ər-ĭt)    
adj.  

1. 
   
   Thoughtless of others; displaying a lack of consideration.
   
   
   
2. 
   
   Not well considered or carefully thought out; ill-advised.
   
   
   

A discussion of what exactly "inconsiderate" means, was had fairly recently. Someone I was talking to felt that this word implied "intent" or malice. I didn't see it that way. It's simply a lack of consideration - without any qualifier of "being done on purpose" or not.