Historical clue formulations

• Obdurate — 2026-09-06
• Poker-faced — 2025-06-02
• Insensitive to human feeling — 2025-01-31
• Poker-faced — 2021-12-07
• Lacking any emotion — 2020-07-11
• Poker-faced — 2020-05-20
• Like New England fields — 2020-05-19
• Poker-faced — 2020-05-02
• Unfeeling — 2020-03-15
• Rugged, as a landscape — 2018-08-26
• Expressionless — 2016-03-29
• Poker-faced — 2015-08-14
• Adamantine — 2011-07-30
• Like poker faces — 2010-02-14
• Expressionless — 2009-05-01
• Like some silences — 2008-12-25
• Like some hard-to-plow land — 2006-11-23
• Expressionless — 2005-11-06
• Poker-faced — 2005-05-09
• Displaying no emotion — 2005-02-13
• Hardhearted — 2004-10-19
• Expressionless — 2004-07-25
• Kind of silence — 1999-12-17
• Expressionless — 1999-04-04
• Unsentimental — 1999-01-14
• Obdurate — 1998-09-11
• Obdurate — 1998-07-05
• Poker-faced — 1994-04-23
• Expressionless — 1994-03-24