Opacity

n.	1.	The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.
	2.	Obscurity; want of clearness.

Noun	1.	opacity - the phenomenon of not permitting the passage of electromagnetic radiation Antonyms: transparence, transparency - permitting the free passage of electromagnetic radiation
	2.	opacity - incomprehensibility resulting from obscurity of meaning Synonyms: opaqueness
	3.	opacity - the quality of being opaque to a degree; the degree to which something reduces the passage of light Synonyms: opaqueness Antonyms: uncloudedness, clarity, clearness - the quality of clear water; "when she awoke the clarity was back in her eyes"

abstruseness, adiaphanousness, ambiguity, amorphousness, asininity, blockishness, boobishness, boorishness, bovinity, cloddishness, cloudiness, crassness, crudeness, dark, darkness, denseness, density, dim-wittedness, dimness, doltishness, dull-wittedness, dullardism, dullness, dumbness, duncery, equivocation, fog, fogginess, fuzziness, grossness, hebetude, impenetrability, impermeability, imperviousness to light, indefiniteness, indeterminateness, indistinctness, intransparency, lethargy, loutishness, lumpishness, mist, mistiness, mumbo jumbo, murk, murkiness, mystification, ninnyism, oafdom, oafishness, obfuscation, obscurantism, obscuration, obtuseness, opaque, opaqueness, perplexity, reconditeness, roil, roiledness, shapelessness, simpletonianism, slowness, sluggishness, sottishness, stolidity, stupidity, thick-headedness, thick-wittedness, turbidity, turbidness, unclarity, unclearness, unintelligibility, unplainness, unteachability, vagueness, wrongheadedness, yokelism