Sleaziness
/ˈsliːzinəs/
Definition 1 of 2
Pro Tip 1/3Negative Connotation
Sleaziness implies a strong negative judgment and moral disapproval. 
The public was appalled by the sleaziness of the official's actions.
Pro Tip 2/3Often Personal
Use sleaziness to describe underhanded behaviors in personal and professional lives. 
His sleaziness in both his business deals and his marriage was notorious.
Pro Tip 3/3Not Casual
The term is not casual and is quite strong and serious in its accusation. 
Reporters questioned the sleaziness of the mayor's connections.