lucid
lu-cid
adjective
Expressed clearly and easy to understand.
"Her lucid explanation made the complex topic simple."
adjective
Able to think clearly, especially during or after illness.
"He remained lucid despite his advanced age."
Thesaurus
Synonyms: sane, rational, coherent, logical, clear, transparent, crystal clear, crystalline, limpid, pellucid, luculent, perspicuous