lucidness

The quality of being lucid; lucidity.

noun

1. The quality of being clear and easy to perceive or understand: clarity, clearness, distinctness, limpidity, limpidness, lucidity, pellucidity, pellucidness, perspicuity, perspicuousness, plainness. See clear/unclear.
2. A healthy mental state: lucidity, mind, reason, saneness, sanity, sense (often used in plural), soundness, wit (used in plural). Slang marble (used in plural). See sane/insane.