Examples:
* The lout bumped into me in the hallway without even apologizing.
* He's such a lout, always making inappropriate jokes.
* She couldn't believe he was acting like such a lout at the party.
* The lout sat with his feet on the table, not even bothering to ask for permission.
* The manager fired the lout after he refused to follow company policy.
Note: "Lout" is a rather negative term. It's often used to describe someone who is both physically and socially awkward, and it carries a connotation of disrespect.