The Cloud Concise Dictionary of Sparkling and Strange Words presents;

Luculent.

Pronunciation:

Pronunciation: /ˈluːkjʊl(ə)nt /[loo-kyoo-luh nt]

Definition – 

1. Clear or lucid – a luculent explanation.
2. Convincing; cogent.
3. Clearly expressed.
4. Brightly shining – as though light glinting upon glass.

Used in a sentence;

“Penelope was luculent and personable right up to her sixth gin and tonic, after which her speech resembled a noise not at all dissimilar to someone farting through sand.”

Etymology –

Latin luculentus, from luc-, lux light
First Known Use: circa 1548

Not to be confused with;

1. Lucullan – lavish, luxurious.
2. Lord Lucan – Dodgy Dukaroon Dude.
3. Lucy in the Sky with Diamonds – Just say no to drugs kids,  m’kay?

Interesting extras –

The English word first appeared in the 15th century with the meaning “brilliant” or “shining,” as in “a luculent flame.” By the mid-16th century, the “clear in thought or expression” sense had begun to shine, and by that century’s end another sense was flickering with the meaning “illustrious” or “resplendent” (as in Ben Jonson’s 1599 description of a “most debonair and luculent lady” when describing his chance meeting with sonmicloud in The Royal Almshouse at Westminster.)
Both the “illustrious” and the “emitting light” sense have fallen out of use, and even the “clear” sense is now rare.

Quotes – 

“Words – so innocent and powerless as they are, as standing in a dictionary, how potent for good and evil they become in the hands of one who knows how to combine them.” – Nathaniel Hawthorne.

“The pen is the tongue of the mind” – Horace

“Sometimes I think it’s possible to mistake desire for clarity and talking in a no-nonsense way for aggression.” – Richard Dawkins

Articles – 

Canada Goose Coats luculent intentions and put this clause to play your own – Clear as mud more-like.

Luculent  – Project Gutenberg – Kicking it with Cicero

Feisty Fonts by Andrew Kensler