The term "most dallying" refers to someone who is indulging in unnecessary and unproductive activities, often wasting time. To find antonyms for this phrase, we need to look for words that relate to productivity, engagement, and focus. Some possible antonyms for "most dallying" include words such as actively pursuing tasks, being efficient, disciplined, committed, focused, attentive, or diligent. Such words describe someone who is responsible, organized, goal-driven, and works towards achieving their goals, rather than wasting time indulging in frivolous activities. Therefore, we can use these antonyms to describe someone who's excellent at time management, productivity, and goal-orientation.