Definition of opaque adjective from the Oxford Advanced Learner's Dictionary

     

    opaque

     adjective
    adjective
    BrE BrE//əʊˈpeɪk//
     
    ; NAmE NAmE//ˈpeɪk//
     
     
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  1. 1(of glass, liquid, etc.) not clear enough to see through or allow light through opaque glass opaque tights
  2. 2(of speech or writing) difficult to understand; not clear synonym impenetrable The jargon in his talk was opaque to me.
  3. opposite transparent
    Word Origin late Middle English opake, from Latin opacus ‘darkened’. The current spelling (rare before the 19th cent.) has been influenced by the French form.Extra examples As the lens becomes more opaque, the patient notices a falling off in vision. Both question and answer are rather opaque. The complex administrative arrangements mean that the decision-making process remains somewhat opaque. The glasses looked slightly opaque. The system is completely opaque to non-specialists. The windows were nearly opaque with grime. These crystals are completely opaque and nearly black.
See the Oxford Advanced American Dictionary entry: opaque