1.Definition: (of persons) lacking in refinement or grace
2.Definition: (used especially of commodities) being unprocessed or manufactured using only simple or minimal processes
"Bales of rude cotton"
3.Definition: belonging to an early stage of technical development; characterized by simplicity and (often) crudeness
"The crude weapons and rude agricultural implements of early man"
4.Definition: lacking civility or good manners