The antonyms for "more coruscating" might include dull, drab, flat, lifeless, lackluster, or monotone. These words indicate a lack of sparkle, brilliance, or vibrancy. Instead of shining brightly or flashing with energy or enthusiasm, something that is dull or lackluster might be uninteresting, uninspiring, or even boring. These antonyms might be used to describe a conversation, a performance, or even a piece of writing that lacks the liveliness, excitement, or charm that comes with coruscation. By understanding the opposite meanings of these words, we can better appreciate and articulate the qualities that make a great conversation, performance, or piece of writing truly coruscating.