WordWeb Online

1. Not transmitting or reflecting light or radiant energy; impenetrable to sight
   "opaque windows of the jail"; "opaque to X-rays"
    
2. Not clearly understood or expressed
   - unintelligible

Derived forms: opaquest, opaquer

See also: cloudy, fogged, foggy, frosted, glaucous, incomprehensible, lightproof, light-tight, milklike, milky, mirky [archaic], muddy, murky, opacity, opaquely, opaqueness, semiopaque, solid, turbid, unclear, uncomprehensible, whitish

Antonym: clear

Encyclopedia: Opaque