Opaque

a.	1.
	1.	Impervious to the rays of light; not transparent; as, an opaque substance.
	2.	Obscure; not clear; unintelligible.
n.	1.	That which is opaque; opacity.

Adj.	1.	opaque - not clear; not transmitting or reflecting light or radiant energy; "opaque windows of the jail"; "opaque to X-rays" Antonyms: clear - free from cloudiness; allowing light to pass through; "clear water"; "clear plastic bags"; "clear glass"; "the air is clear and clean"
	2.	opaque - not clearly understood or expressed Synonyms: unintelligible

Boeotian, abstruse, adiaphanous, ambiguous, amorphous, amphibological, arcane, asinine, backward, baffling, becloud, beef-brained, beef-witted, black, blind, blockish, blurred, blurry, bovine, chumpish, clear as mud, cloddish, cloud, clouded, cowish, crass, cryptic, dark, darken, dense, doltish, dull-witted, dullard, dumb, duncical, duncish, dunderheaded, elusive, enigmatic, equivocal, fat, foggy, fuzzy, gross, grumly, hazy, impenetrable, impermeable, impervious to light, indefinite, indeterminate, ineducable, intransparent, klutzy, lumpish, misty, muddy, mysterious, mystifying, nebulous, nubilous, oafish, obfuscated, obscure, obscured, perplexing, puzzling, recondite, roiled, roily, shapeless, slow, smoky, sottish, stolid, stupid, tenebrous, thick, thickheaded, transcendent, turbid, uncertain, unclear, unfathomable, unintelligent, unintelligible, unplain, unteachable, vague, wrongheaded