Which term describes a material that does not allow light to pass through?

Explanation

The correct answer is 'Opaque,' which means a substance that blocks light completely. 'Lackluster' refers to something dull or uninspiring, 'Shadowy' indicates an area with little light, 'Unclear' means not easily understood or seen, and 'Translucent' describes a material that allows some light to pass through but is not fully transparent.