The antonyms for the word "most aglow" include dull, dark, gloomy, dim, and lackluster. These words refer to the absence or reduction of brightness, energy, or radiance. While "most aglow" signifies a shining or glowing effect that creates a sense of warmth and vibrancy, its antonyms suggest the opposite. For instance, "dull" and "lackluster" indicate a lack of excitement or interest, while "dark" and "gloomy" imply a sense of sadness, pessimism, or negativity. On the other hand, "dim" suggests a lessened or inadequate level of illumination or clarity. Therefore, understanding antonyms of a word allows for the development of a broader and more nuanced vocabulary.