lucidness

noun

1. (uncountable)The property of being lucid; lucidity.

   “The lucidness of his answers argued against his being insane or confused.”

   “Surprised and rejoiced thus far at the unanticipated newness, and the sweet lucidness and simplicity of Isabel’s narrating, […] Pierre now, in handing the instrument to Isabel, could not entirely restrain something like a look of half-regret, accompanied rather strangely with a half-smile of gentle humor.”