Historical clue formulations

• Not set in stone — 2025-01-03
• Gender-___ — 2021-11-05
• Tending to change — 2020-06-06
• Subject to change — 2014-02-01
• Not static — 2004-11-21
• Unfixed — 2003-03-30
• Not settled — 2002-05-24
• Smooth in motion — 1999-03-31
• Not fixed — 1998-04-11
• Unsettled — 1995-04-14