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opaque (adj.)

early 15c., opake, "dark, shaded, unlit" (a sense now obsolete), from Latin opacus "shaded, in the shade, shady, dark, darkened, obscure," of unknown origin. Spelling influenced after c. 1650 by French opaque (c. 1500), from the Latin. Meaning "impervious to the rays of light" is from 1640s. Figurative sense of "obscure, hard to understand" is from 1761. Related: Opaquely; opaqueness.

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Definitions of opaque

opaque (adj.)
not transmitting or reflecting light or radiant energy; impenetrable to sight;
opaque windows of the jail
opaque to X-rays
opaque (adj.)
hard or impossible to understand;
Synonyms: unintelligible
From wordnet.princeton.edu