Which word best describes someone who is crass?

The word that best describes someone who is crass is indeed crude and unrefined. When a person is characterized as crass, it often implies a lack of sensitivity, refinement, or good manners. Such individuals may use language or exhibit behaviors that are considered vulgar, rash, or lacking in taste. This term captures the essence of their demeanor as being rough around the edges and not polished in their interactions or expressions.

In this context, crassness is associated with a disregard for social etiquette, leading to behavior that can be perceived as boorish or insensitive. Hence, the characterization of someone as crude and unrefined encapsulates both the behavioral and communicative aspects of being crass, making it the most fitting choice.