Not allowing light or radiant energy to pass through; impenetrable to sight.
A document in an otherwise transparent file format whose markup, or absence of markup, has been arranged to thwart or discourage subsequent modification by readers.
Not clearly understood or expressed.
not clear; not transmitting or reflecting light or radiant energy; "opaque windows of the jail"; "opaque to X-rays"
not clearly understood or expressed
not transmitting or reflecting light or radiant energy; impenetrable to sight
