The document on the right crowds the logo and looks unprofessional.

In public situations such as a nightclub or bar, staff that get into shouting matches with patrons look badly unprofessional.

"You don't want to look unprofessional after sleeping in an aircraft," another pilot said.

If she ranted and raved, she'd look unprofessional and he could feel better about things.

"Without rules and regulations, we would look unprofessional, but let's be reasonable."

People use words like "utilize" because they think that "use" looks unprofessional.

People are less likely to buy a product that looks unprofessional.

Why bother with one that looks unprofessional and will be difficult to work with?

Although a model with putty often looks unprofessional at an early stage, careful painting can completely hide defects.

It doesn't serve the article or audience and looks unprofessional on what I consider a professional website.