Headway is a term used to describe the progress or advancement made towards a particular goal, objective or task. Antonyms for headway generally refer to a lack of progress or advancement, including stagnation, regression, delays, setbacks, and obstacles. Stagnation is a state of being in which progress or growth is halted or slowed down, while regression is the opposite of progression and involves a backslide or reversal of progress. Delays and setbacks are impediments that slow down progress or make it come to a halt, and obstacles are challenges that hinder or prevent progress altogether. In essence, antonyms for headway are anything that may impede, delay or halt progress, rendering achievement impossible.