The antonyms for the word "most dawdling" include "fastest," "quickest," "hurried," and "hasty." These words all convey a sense of speed and urgency, which is the opposite of dawdling. Other antonyms for "most dawdling" are "prompt," "quick," and "swift." Using these words in place of "most dawdling" can help convey a sense of efficiency and productivity. For example, instead of saying "He was the most dawdling employee," you could say "He was the least prompt employee" or "He was the slowest worker on the team." By using these antonyms, you can better convey the traits you want to emphasize in your writing.