<p><strong>Adjective</strong></p><ul><li>not transparent or translucent</li><li>impenetrable to light</li><li>not allowing light to pass through</li><li>not shining or bright</li><li>dark</li><li>dull</li><li>hard to understand</li><li>not clear or lucid</li><li>obscure</li><li>dull, stupid, or unintelligent</li></ul><p><strong>Synonyms</strong></p><ul><li>muddy</li><li>cloudy</li><li>murky</li></ul><p><strong>Noun</strong></p><ul><li>something that is opaque</li><li>a coloring matter, usually black or red, used to render part of a negative opaque</li></ul><p><strong>Verb</strong></p><ul><li>to cover up blemishes on (a negative), especially for making a printing plate</li><li>to cause to become opaque</li></ul><p><strong>Comparative</strong></p><ul><li>more opaque</li></ul><p><strong>Superlative</strong></p><ul><li>most opaque</li></ul>