opaque

adjective

1. not transmitting or reflecting light or radiant energy; impenetrable to sight

- opaque windows of the jail

- opaque to X-rays

Similar word(s): unclear, cloudy, mirky, muddy, murky, turbid, fogged, foggy, frosted, glaucous, lightproof, milklike, milky, whitish, semiopaque, solid

2. (figuratively) unclear, unintelligible, hard to get or understand.

Similar word(s): incomprehensible, uncomprehensible, unintelligible

noun

1. (obsolete, poetic) An area of darkness; a place or region with no light.

2. Something which is opaque rather than translucent.

verb

1. (transitive) To make, render (more) opaque.