| Answer | Crossword Clue |
|---|---|
| lightproof | impervious to light also LIGHTTIGHT |
| lighttight | impervious to light also LIGHTPROOF |
| opaquest | OPAQUE, impervious to light |
| opaquely | OPAQUE, impervious to light |
| opaquer | OPAQUE, impervious to light |
| opacify | to make opaque (impervious to light) |
| opaque | to make opaque / impervious to light |
| opacified | OPACIFY, to make opaque (impervious to light) |
| opacifies | OPACIFY, to make opaque (impervious to light) |
| opacifying | OPACIFY, to make opaque (impervious to light) |
