Historical clue formulations

• Habituate — 2025-10-17
• Harden (to) — 2024-07-14
• Harden (to) — 2022-10-25
• Harden — 2022-10-09
• Accustom — 2022-07-07
• Harden (to) — 2022-06-27
• Accustom — 2021-07-26
• Accustom to difficulty — 2020-12-08
• Get accustomed (to) — 2020-11-29
• Temper — 2020-04-26
• Habituate — 2019-03-14
• Accustom (to) — 2018-09-19
• Habituate — 2018-05-22
• Temper — 2016-12-04
• Temper — 2016-08-26
• Harden — 2016-07-10
• Toughen — 2015-10-24
• Become less sensitive (to) — 2015-06-02
• Become accustomed (to) — 2015-05-25
• Temper — 2015-05-15
• Toughen — 2013-06-26
• Harden (to) — 2012-08-13
• Accustom — 2012-02-22
• Accustom — 2011-07-25
• Accustom — 2011-04-10
• Accustom — 2010-05-09
• Get used (to) — 2010-03-28
• Toughen, as to hardship — 2009-12-22
• Accustom — 2008-02-17
• Harden — 2007-10-18
• Accustom to hardship — 2007-03-19
• Condition — 2007-01-13
• Naturalize — 2006-06-03
• Condition — 2005-03-20
• Condition — 2005-01-07
• Get used (to) — 2004-08-23
• Accustom — 2004-06-09
• Harden — 2004-04-13
• Harden — 2004-03-03
• Accustom — 2004-01-29
• Harden — 2003-12-26
• Make used (to) — 2003-09-19
• Habituate — 2003-07-27
• Harden — 2003-05-02
• Caseharden — 2002-09-14
• Habituate — 2002-05-21
• Toughen — 2002-04-27
• Habituate — 2002-02-13
• Get used (to) — 2001-10-01
• Accustom (to) — 2001-04-22