crude

In a natural, untreated state.

crude oil

Characterized by simplicity, especially something not carefully or expertly made.

a crude shelter

a crude estimate

Lacking concealing elements.

a crude truth

Lacking tact or taste.

a crude remark

You shouldn't use such crude language when talking to the bank manager.

Not adjusted or further analyzed.

Any substance in its natural state.

Ellipsis of crude oil.

The dawn of the oil age was fairly recent. Although the stuff was used to waterproof boats in the Middle East 6,000 years ago, extracting it in earnest began only in 1859 after an oil strike in Pennsylvania. The first barrels of crude fetched $18 (around $450 at today’s prices).