Headway refers to progress or forward movement. Antonyms for headway would describe a lack of progress or movement in the opposite direction. Some antonyms include stagnation, regression, setback, hindrance, and obstacle. Stagnation refers to a lack of movement or progress, while regression implies a backward movement. Setback refers to a sudden obstacle or challenge that can hinder progress. Hindrance and obstacle both suggest something that blocks or impedes progress. Ultimately, antonyms for "headway" describe situations where progress is not being made, or obstacles are preventing forward movement. It is important to identify and address these antonyms in order to move forward and make positive strides towards success.