free from obscurity and easy to understand; the comprehensibility of clear expression
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a lucid state of mind; not confused
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Lucidity \Lu*cid"i*ty\, n. [Cf. F. lucidit['e]. See {Lucid}.] The quality or state of being lucid.
They do it with exemplary lucidity.
"Moravia was ageless, with his mental lucidity and constant presence in the literary and cultural life of our time," said Valentino Bompiani, who published Moravia's works for more than 50 years.