clearness

The quality or state of being clear.

Syn. -- Clearness, Perspicuity. Usage: Clearness has reference to our ideas, and springs from a distinct conception of the subject under consideration. Perspicuity has reference to the mode of expressing our ideas and belongs essentially to style. Hence we speak of a writer as having clear ideas, a clear arrangement, and perspicuous phraseology. We do at times speak of a person's having great clearness of style; but in such cases we are usually thinking of the clearness of his ideas as manifested in language. «Whenever men think clearly, and are thoroughly interested, they express themselves with perspicuity and force.» Robertson.

noun

The quality of being clear and easy to perceive or understand: clarity, distinctness, limpidity, limpidness, lucidity, lucidness, pellucidity, pellucidness, perspicuity, perspicuousness, plainness. See clear/unclear.

The noun has 2 meanings:

Meaning #1: free from obscurity and easy to understand; the comprehensibility of clear expression
  Synonyms: clarity, lucidity, pellucidity, limpidity
  Antonym: unclearness (meaning #1)

Meaning #2: the quality of clear water
  Synonyms: clarity, uncloudedness