A stultifier, a term used to describe something that hampers or obstructs progress, encompasses a multitude of synonyms that vividly capture the essence of this notion. Firstly, an impediment serves to hinder or delay advancement, presenting roadblocks and challenges. Similarly, an obstacle denotes something that stands in the way of progress, impeding smooth attainment of goals. A hindrance typifies an object or situation that obstructs development, causing setbacks or limitations. Furthermore, a deterrent acts as a discouraging factor that dissuades or prevents progress. Lastly, a frustration epitomizes the feeling of being thwarted or impeded, leading to a slowdown or deadlock. Each of these synonyms encapsulates the notion of a stultifier, emphasizing the barriers that inhibit growth and productivity.