Historical clue formulations

• Clever — 2025-12-23
• Perceptive — 2024-12-26
• Not born yesterday, so to speak — 2024-12-21
• Perceptive — 2024-08-18
• Sharp-witted — 2022-07-11
• Discerning — 2022-05-31
• Hard to fool — 2021-01-01
• Shrewd — 2020-12-08
• Sharp — 2020-11-14
• Sharp — 2020-01-03
• Quick — 2019-09-12
• Uncommonly perceptive — 2019-08-05
• Sharp-minded — 2019-01-20
• Quick on the uptake — 2016-05-31
• Sharp — 2014-10-18
• Insightful — 2013-01-14
• Sharp as a tack — 2011-07-26
• Sharp — 2009-05-16
• Discerning — 2008-07-22
• Shrewd — 2008-07-04
• Not dull — 2006-03-05
• Mentally sharp — 2005-11-28
• Sharp as a tack — 2005-11-02
• Not easily misled — 2004-04-24
• On the ball — 2004-03-28
• Shrewd — 2003-02-18
• Keen — 2003-02-02
• Shrewd — 2002-08-26
• Not born yesterday — 2000-03-08
• Smart — 1999-05-13
• Quick — 1999-05-01
• Sharp as a tack — 1998-02-08
• Perspicacious — 1997-09-18
• Quick — 1995-11-16