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Why is there a lukewarm but no lukecool?
(lemmy.ca)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
As mentioned elsew, tepid means lukewarm. Between room temperature and warm.
So if tepid is between warm and room temperature, what is between cool and room temperature?