clearness

noun4

1. •
   The state of being free from obscurities or opacity; distinctness of light, colour etc.

   • The clearness of the water meant I could still see the key lying on the river-bed.
2. •
   Mental or sensory distinctness; clarity of understanding, perception etc.

   • The daily press is the evil principle of the modern world, and time will only serve to disclose this fact with greater and greater clearness. — 1966
3. •
   The state of being free from obstruction or interference.

   • The clearness of the path made for an easy hike.
4. •
   (no longer used) Brightness, brilliancy.