lucid
adj.expressing ideas in a way that is very clear and easy to understand. It can also describe a person who is thinking clearly after being confused or sick.
adj.characterized by clear, intelligible expression or logical consistency; also used to describe a patient’s return to a normal state of consciousness. Adjective.
“She gives a lucid explanation of the difficult theory.”
“The professor provided a lucid summary of the legal reforms that helped even the novice students grasp the core concepts.”
“The elderly man had several lucid moments during the afternoon, during which he was able to recognize his children and discuss his medical wishes with the doctor.”
“We will never learn what prompted Jack to follow his mam – only that he knew, in that terrible, lucid way kids know.”
Latin lucidus, from lūceō (“shine”) + -idus.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.