noun
clearness, lucidity, limpidness, limpidity, purity, brightness, precision, explicitness, exactness, decipherability, intelligibility, simplicity, explicability, perceptibility, penetrability, unmistakability, distinctness, comprehensibility, plainness, lack of ambiguity, plain speech, legibility, openness, directness, perspicuity, evidence, prominence, manifestness, overtness, salience, transparency, pellucidity, translucence, palpability, conspicuousness, certainty; see also accuracy 2, simplicity 1.
Antonyms haziness, obscurity*, vagueness.