(of a person, speech, manner etc) showing education and cultured taste
cultured, civilized
Cases of word usage
1) (of materials) in a natural state; not refined or manufactured (crude)
2) refined petroleum, used as a fuel in vehicles, planes etc (petrol)
3) a place, building etc where oil or sugar is refined (refinery)
4) a thick, sticky, dark liquid produced while sugar is being refined (treacle)