Historical clue formulations

• Coarse — 2025-04-16
• Unrefined — 2024-05-09
• Apt rhyme for "lewd" — 2024-03-26
• Unpolished — 2022-05-13
• Yet to be processed — 2021-09-24
• In need of refinement — 2019-12-10
• Unrefined barrelful — 2019-11-06
• Like some oil and remarks — 2019-06-12
• Potty-mouthed — 2016-05-31
• Lacking subtlety, say — 2016-05-13
• Vulgar — 2016-02-09
• It needs refinement — 2013-06-09
• Unrefined oil — 2012-10-08
• Oil directly from a well — 2010-06-07
• Like oil directly from a well — 2009-07-13
• Boorish — 2009-07-08
• Neanderthal — 2008-06-27
• Oil by the barrel — 2007-12-30
• Primitive — 2007-09-16
• Boorish — 2005-05-04
• Rudimentary — 2001-02-16
• Unrefined — 2000-10-05
• Displaying 5-Down — 2000-03-26
• Tanker's cargo — 1997-09-19
• Well-made product? — 1996-07-14
• Oil-field oil — 1995-08-10