Select the word that has the opposite meaning as the given word: Luminous

The word "luminous" refers to something that emits or reflects light, which gives it a bright and radiant quality. The opposite of this would be a word that denotes the absence or lack of light. In this context, "dark" effectively conveys the opposite meaning of "luminous," as dark environments are characterized by little or no light.

The other options do not serve as direct opposites to "luminous." "Bright" suggests a high level of light or illumination, which aligns with the meaning of "luminous" rather than opposing it. "Colorful" refers to having a variety of colors and does not relate to light or brightness. "Transparent" describes a property of allowing light to pass through but does not indicate the absence of light or brightness, making it unrelated to the concept of being luminous. Thus, "dark" is the correct choice as it directly contrasts with the quality of being luminous.