The word "proceeder" refers to someone who moves forward or advances in a particular task or activity. As such, its antonyms would be words that indicate the opposite of this action. Some possible antonyms for "proceeder" include words like "retreater," "backtracker," "retrier," "delayist," or "lingerer." These words all suggest someone who is hesitant, slow, or reluctant to move forward, whether because of fear, doubt, or lack of commitment. Other antonyms might include words like "hesitator," "dawdler," "waverer," or "inhibitor," which all suggest a lack of decisiveness, focus, or momentum in pursuit of a goal.