Historical clue formulations

• Monotony — 2024-07-14
• Monotony — 2015-07-07
• Monotony — 2015-05-28
• Rote learning, to most people — 2013-08-07
• Ho-humness — 2012-03-19
• Lack of variety — 2007-09-30
• Night guard's problem — 2004-10-24
• Monotony — 2001-02-10
• Ordinariness — 1999-03-27
• It's all the same — 1996-10-26
• Ennui — 1995-01-05