1.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"

Related Adjective(s):primitive, rude

2.Definition: conspicuously and tastelessly indecent

"A crude joke", "Crude behavior"

Related Adjective(s):earthy, gross, vulgar

3.Definition: devoid of any qualifications or disguise or adornment

"The crude facts"

Related Adjective(s):blunt, stark

4.Definition: not carefully or expertly made

"Managed to make a crude splint", "A crude cabin of logs with bark still on them"

Related Adjective(s):rough

5.Definition: not processed or subjected to analysis

"Only the crude vital statistics"

Related Adjective(s):raw

6.Definition: not refined or processed

"Crude oil"

Related Adjective(s):unprocessed, unrefined