Crude oil.
Any substance in its natural state.
In a natural, untreated state.
Characterized by simplicity, especially something not carefully or expertly made.
Lacking tact or taste.
Lacking concealing elements.
Pertaining to the uninflected stem of a word.
A mixture of gaseous hydrocarbons associated with petroleum deposits; mostly methane with smaller amounts of ethane, propane and butane; principally used as a fuel.