Definitions of crude:

• noun:   a dark oil consisting mainly of hydrocarbons
• adjective:   not carefully or expertly made

  Example: "Managed to make a crude splint"

• adjective:   not processed or subjected to analysis

  Example: "Only the crude vital statistics"

• 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:   conspicuously and tastelessly indecent

  Example: "A crude joke"

• adjective:   not refined or processed

  Example: "Crude oil"