The word for today is…
lucid (adjective):
1 : very clear and easy to understand
2 : able to think clearly
Source : Merriam -Webster
Etymology : It’s easy enough to shed some light on the origins of lucid: it derives—via the Latin adjective lucidus, meaning “shining”—from the Latin verb lucere, meaning “to shine.” Lucid has been used by English speakers since at least the late 16th century. Originally, it meant merely “filled with light” or “shining,” but it has since developed extended senses describing someone whose mind is clear or something with a clear meaning. Other shining examples of lucere descendants include translucent, lucent (“glowing”), and the somewhat rarer relucent (“reflecting light” or “shining”). Even the word light itself derives from the same ancient word that led to lucere.
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