Historical clue formulations

• Unswayable — 2024-06-30
• Firm in one's stance — 2023-05-23
• Rigid — 2019-04-06
• Disinclined to move — 2015-01-02
• Unyielding — 2012-12-02
• Inflexible — 2005-06-23
• Refusing to give — 2004-10-09
• Rigid — 2003-05-18
• Not budging — 2002-09-15
• Not budging — 2002-07-15
• Not budging — 2002-04-21
• Inflexible — 2002-03-21
• Unyielding — 2001-02-28
• Far from easygoing — 1999-07-16
• Inflexible — 1998-03-15
• Inflexible — 1997-02-22
• Unyielding — 1995-01-10
• Unyielding — 1994-05-17
• Headstrong — 1994-02-17