The antonym for the word "most throbbing" would be "least dull". "Most throbbing" implies a very strong and intense sensation, while "least dull" suggests the opposite - a lack of intensity or sensation altogether. Other antonyms that could be used include "soft", "mild", "subtle", "weak", or "faint". These antonyms can be used to describe levels of pain, sound, or emotion, among other things. It is important to understand the context in which these words are used to ensure accurate communication and understanding.