Definitions of rude:

• adjective:   socially incorrect in behavior
• adjective:   lacking civility or good manners
• adjective:   belonging to an early stage of technical development; characterized by simplicity and (often) crudeness

  Example: "The crude weapons and rude agricultural implements of early man"

• adjective:   (of persons) lacking in refinement or grace
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #8248)