Historical clue formulations

• Profound — 2026-09-22
• Profound — 2026-07-12
• "Whoa ... that's too much for my brain to handle!" — 2026-01-30
• Like the Mariana Trench — 2025-12-29
• Like certain thoughts and pockets — 2025-12-03
• Word with six or sea — 2025-06-26
• Word with six or sea — 2025-03-28
• Thought-provoking — 2024-07-10
• Profound — 2024-04-17
• "Whoaaaaaa"-inducing — 2023-09-17
• Yawning — 2023-05-21
• Basslike — 2023-04-06
• Profound — 2022-11-23
• Challenger ___ (lowest known point in the earth's oceans) — 2021-10-08
• Like a basso's voice — 2021-09-06
• Like the diving end of a pool — 2021-06-15
• Like the part of a swimming pool with the diving board — 2020-07-27
• Low-pitched — 2020-05-05
• Meaningful — 2020-04-04
• Profound — 2020-03-31
• Very thought-provoking — 2019-09-12
• Profound — 2019-07-22
• Pitched low — 2019-03-10
• Profound — 2019-01-28
• Like the part of a pool with a diving board — 2019-01-08
• Thought-provoking — 2019-01-06
• Not easily understood — 2019-01-03
• Like discussions of metaphysics — 2018-10-13
• Profound — 2018-10-09
• Tough to grasp — 2017-01-11
• How a daring quarterback may throw — 2016-01-27
• Way down — 2015-08-07
• Worthy of pondering — 2015-07-05
• Almost to the outfield wall — 2014-08-20
• Shallow's opposite — 2013-11-11
• Many-layered — 2012-08-19
• How a quarterback may throw a ball — 2011-07-26
• Furrow-producing — 2011-01-05
• Profound — 2010-01-18
• Profound — 2009-11-16
• Hard to fathom — 2009-06-30
• Bottomless — 2008-08-11
• Profound — 2008-06-18
• Profound — 2008-05-12
• Tough to fathom — 2007-11-27
• Tough to fathom — 2007-11-21
• Not shallow — 2007-03-26
• Heavy — 2006-10-22
• Seemingly bottomless — 2006-06-27
• Requiring much thought — 2005-06-03