Historical clue formulations

• Not very animated — 2025-06-06
• Like a good poker face — 2025-05-21
• Betraying no emotion — 2023-05-18
• Impassive — 2022-10-29
• Calm and impassive — 2020-10-19
• Unemotional — 2019-03-03
• Wooden — 2015-08-07
• Unemotional — 2011-10-03
• Hard to stir — 2010-11-12
• Not easily stirred — 2010-03-21
• Impassive — 2008-05-04
• Unexcitable — 2005-09-18
• Unemotional — 2001-04-22
• Stone-faced — 2001-01-17
• Unemotional — 1998-05-11